Mattresses.
Although mattresses aren’t sold in most thrift shops, it probably wouldn’t be the best idea to buy a used mattress if you come across one.
Rather than risk bringing bedbugs or other germs into your home, Duct Tape and Denim and Six Dollar Family both recommend that you buy a new mattress.
Mattresses are the most obvious carrier for bedbugs, and it can be very difficult to decontaminate a mattress that has been infected with them. Not to mention, there’s no way to tell if a mattress has been infected with bodily fluids, lice, or other mites.