First thing I will tell you is do NOT buy any electronic calls from Amazon. There's the odd handcall on there that would do ok but besides that what is offered is low grade junk.
I think I'm the guy longstud is referring to in that I make custom handcalls for calling coyotes. That being said I will not pretend to be elitist in saying they are the only way to put fur on the ground. If you are looking for Ecalls the brands to buy are foxpro, lucky duck, or icotec, with honorable mention to primos. Pretty much all of what they offer will call coyotes but the lower priced options will have less sounds and volume. For premium sound models get foxpro from MFK. Lucky duck from Rick at verminator predator calls and icotec from Tony tebbe at predator university.
If you want to dip your toes in the water a good open reed and closed reed handcall can go a long ways. I make custom wood and acrylic calls but even some mass produced calls can get the job done if your on a budget.
I'm always game to talk coyotes and calls so if you have any questions don't hesitate to ask.
Here's a pic of my current lanyard of calls to give you an idea.
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