Tracy, I have a double guillotine trap from Advanced Traps, and it's been well worth the money. I really like mine in underwater entrances, because all you need to do is drive by and see if the gates are down. If they are, you more than likely caught something.
AT is redoing their website, but you can look at all the traps at trappintales.com. They have 7-8 traps that are designated for otters.
