Small Game, Predator and TrappingFrom shooting squirrels in your backyard to calling coyotes in Arizona. This forum now contains trapping information..
I know you are asking for an e-caller, but I suggest using mouth calls. E-callers do have there advantages (expensive FoxPros), but one for under $100, you aren't going to get much. Just check Cabelas online.
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"Real knowledge is to know the extent of one’s ignorance."
I use a Cass Creek E-Caller and have had good results from it. I got mine for about 40$ but you can also get the same as mine plus a wireless remote for an added 30$ I think. But like nick said get 3-4 good mouth calls and you will have more luck most of the time and they are less expensive.