Jango Newbie is correct, Harbor Freight has them and they were on sale not too long ago for about $10.00. Be careful when using the heat-gun on ABS. If you get ABS too hot, it will begin to wrinkle the plastic.
Sintra is able to handle heat much better than ABS plastic.
I started yesterday shaping my Sintra pieces...
I did the smaller ones (like the shoulder bells) in boiling water and the larger pieces with a heat gun and so far it is working great!
Thanks for the tips guys!