If you're shopping online or at a secondhand store without a fitting room, use a measuring tape to take your measurements beforehand.
Most antique or secondhand items will not be in pristine condition, but certain rips and tears are more manageable than others.
If you're looking through a collection of old furniture or clothing, pay attention to the tags and maker's marks to identify the item's quality and history.
If you buy an Instant Pot for $6 and it won't even turn on when you get it home, it's a complete waste of money.
When faced with a mammoth antique mall, it's much easier to divide and conquer. Go thrifting with a buddy who has the same thrift store itch.
If the blouse doesn't fit, it wasn't meant to be. Also, don't buy something too small only to diet to fit into it.
Do a fast Google search before purchasing an expensive piece of furniture or an expensive suit to ensure that the resale business is charging a fair amount.
Drop off that bag of clothing you've had sitting in your closet for months while you're out thrifting.
Haggling is the name of the game in places like secondhand shops and flea markets. Make an offer if you're interested in something.
It's best not to buy used products like car seats and bicycle helmets unless you absolutely need them.