Be thankful you don't have wolves to trap.
$30 EACH --> http://www.nwtrappers.com/catalog/pr...p?prod=MB750WO
Even GOOD coyote traps will run you $20 a piece. If I was really into it, I'd have a pile of either Montana #3 dogless offset and laminated traps, which are about $20 each or some MB which are about the same.
Even if you buy cheap traps without the mods I mentioned, by the time you do the modding yourself, they'll be expensive.
You've got to pay to play.