If you want to make your own, check this out:
Varmint Al's Hunting Page
I made one. Fairly cheap and easy and totally customizable. Spend as much or as little as you want.
Then use an MP3 player with your own custom sounds. I download all kinds of sound files for free and use Audacity
to create custom sound files. You can even make YouTube videos into sound files and then use audacity to pick out the sections of the files you want to use.