I'm terrible at pricing and always charge less than what I should I'm sure. I tried to figure a base price for the wood I use and then go from there. So for some like a nice slab of crotch black walnut I might would say $40-50 then a few hours of labor might go to $75.
But like I said probably under priced, shoot I have two decoys I'm carving right now for a guy and only charging $60 a piece. Most guys around here are in the $100's per decoy.
If you're happy making it for the price you sold it for then don't worry about the lack of profit. Half the time I carve stuff and give it away just because I enjoy making stuff and seeeing people enjoy having it.