I have never sold belt buckles before, but I figured these were worth more than the dollar each that I paid for them. After some research, I found that some belt buckles will go for upwards of $50. It looks like a $1 gamble is a good investment. Even if you get a few duds, you can save them up and put them in a lot.
Gun Belt Buckles Winchester, Smith & Wesson .44 Magnum Ends May 11
Update: Sold for $8.39