Hey man, talkboxes are easy to make, if you need one. Buy a really really cheap microphone and plug it into you amp's output so that all your sound is coming out of the mic. I know this sounds strange, but trust me. put the mic on a stand where you can play your guitar. move your mouth around to make different sounds. you'll have to use another microphone to amplify the sound, because it's very quiet. if you want, you can put a plastic tube around the 1st mic to put inside your mouth. the vocal effect is more pronounced like this. hope that helped. i've had to do this the simple way in a pinch.

Atomic