Best Of & ComparisonsBeginner6 min read

The top 10 things to buy used — and 5 to always buy new

Where the secondhand market hands you 50–90% discounts on barely-used goods, and the short list of items where used is a false economy.

The secondhand market is the closest thing personal finance has to a legal cheat code: entire categories of goods lose half their value the moment the box opens, while losing almost none of their function. Buying used in those categories isn't deprivation — it's arbitrage. But the cheat code has a few cursed items, too: categories where the used discount is small, the failure risk is high, or the hygiene math is unappealing. Here's the ranked list of where used wins biggest, and the short list where new is worth every dollar.

Rank	Category	Typical used discount	Why it works
1	Books and media	70–90%	Function loss: zero
2	Baby and kid gear (non-safety)	60–80%	Outgrown in months, barely used
3	Furniture (solid wood)	50–80%	Quality used beats new flat-pack
4	Exercise equipment	50–80%	The world's guiltiest sellers
5	Tools	40–70%	Quality tools outlive owners
6	Cars (the classic)	30–50% by year 5	Depreciation already paid
7	Musical instruments	30–60%	Well-made ones hold tune, not price
8	Sports and outdoor gear	40–70%	Hobbies get abandoned seasonally
9	Clothing (kids' and quality adult)	50–90%	Especially fast-outgrown sizes
10	Video games and consoles	30–60%	Last generation is 90% of the fun

The best used buys, ranked by typical discount versus new for near-identical function.

Why the top of the list is nearly free money

The pattern in the top entries is identical: items that people buy aspirationally and abandon quickly. The exercise bike used eleven times, the bread maker used twice, the baby swing outgrown in four months — these flood the secondhand market in near-new condition because the previous owner's optimism, not the item's durability, was the thing that failed. Books, kid clothes, and last-generation game consoles add a second force: the market moves on to new releases while the old ones remain perfectly functional. In these categories you're not buying 'worn out' — you're buying someone else's abandoned intention at a 60–90% discount.

Furnishing a nursery, two ways

Outfitting a first nursery new — crib, dresser, glider, swing, high chair, clothes, toys — can easily run $2,500+. The same list sourced secondhand (with a new mattress and a new car seat, per the safety rules below) routinely comes in under $800, because baby gear is the single most oversupplied category in the used market. That's a four-figure saving on items used for months, not years.

The 5 things to always buy new

The used market's cursed items share one of three flaws: invisible safety history, invisible wear, or hygiene you can't verify. Car seats top the list — they have expiration dates and any crash history invalidates them, and you cannot see either by inspection. Helmets share the same one-crash problem. Mattresses carry hygiene risk plus the bed-bug lottery, and their wear is structural and hidden. Tires age chemically even with good tread — check the date code — and their failure mode is a highway event. And anything that touches safety-critical software support, like an unsupported baby monitor or ancient smart lock, fails in ways you won't detect until it matters.

Car seats — expiration dates and unverifiable crash history.
Helmets (bike, ski, motorcycle) — one impact ends their protective life, invisibly.
Mattresses — hidden structural wear plus hygiene and pest risk.
Tires — chemical aging and hidden damage with catastrophic failure modes.
Shoes for serious use — running shoes and work boots wear to the previous owner's gait.

The middle categories need a test, not a leap

Electronics, appliances, and power tools sit between the lists: excellent used buys when you can test them, gambles when you can't. Buy them locally where you can plug them in, run a cycle, or check battery health — and check whether the model still receives software or parts support. 'Untested, sold as-is' in these categories is a lottery ticket priced like a product.

Where to hunt

Local marketplaces and estate sales are strongest for furniture and tools (no shipping, real inspection); consignment and online resale platforms dominate clothing; specialized used markets serve instruments, games, and sports gear with some grading standards. For kid gear, local parent groups are the highest-quality supply at the lowest prices — items move between families faster than they wear out. The universal rule: prices are softest at life transitions, so January (resolutions abandoned), late spring (moves), and the weeks after the holidays are the buyer's calendar.

The verdicts

Default to used for anything in the top-ten list — the function-per-dollar gap is too large to ignore.
Always new for the five safety-and-hygiene categories, no exceptions for a good deal.
Test-before-buy for electronics and appliances; walk away from 'untested.'
Time big purchases to the abandonment calendar: January and moving season.

Sell into the same arbitrage

The same dynamics work in reverse: your own outgrown kid gear, abandoned hobby equipment, and finished books are someone else's top-ten list. A twice-yearly sell-off funds a surprising share of the replacement buying — the used market is a loop, not a one-way discount.

The bottom line

Buying used isn't a downgrade in the top ten categories — it's the same product minus the depreciation someone else already paid. The skill is knowing where the discount is real (abandoned intentions, outgrown phases) and where it's a trap (invisible safety history, unverifiable wear). Default to used where function survives ownership, pay full price where safety doesn't, and let other people's optimism furnish your house.

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