From the Kingdom of Lilliput Miniature Firearms of David Kucer

Bought: $1.70 Sold: $19.98 Fees: $3.92 Profit: $14.36

I purchased 3 of these at a antique mall for 50 cents each. Someone bought two of them in one order. Not a huge profit, but turning 50 cents into $10 with a minimal amount of work is hard to beat.