My family (parents, grandparents) is big into antiquing. My parents aren't into it much anymore but back when my grandparents owned an antique mall in town they did a lot more. My grandpa still finds every garage sale he can and ends up making tons of profit on simple things.
One of the things he got a few years back was a box of these old weber dairy bottles, they're only like 3 inches tall. He bought the box for like 25c and each bottle sold for around $40 each. It's pretty cool.
