There's a very good chance that a small fortune is gathering dust in someone's kitchen cabinet right now. Grandma's old casserole dish, that funky mixing bowl from the thrift store, the colorful glass ...

Shoppers regret "cheating" with a cheaper set.

Pyrex dishware is always a great score at the thrift store. However, this rare pattern from an early collection is worth thousands as only a few were ever made.