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.
The heat gun works well if you want to bend a specific area.
Be careful, & DO NOT HEAT THE FRONT SIDE OF YOUR ARMOR.
especially on Sintra.
it can cuase burning & discoloration.
trust me:facepalm
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!