I got it on Amazon, but I'll have to look it up, I don't see it in my history so it must have been a while ago.
Yes, you must use an ink jet according to the instructions, I guess a laser printer would melt the vinyl.
With the self adhesive monokote, yes! I've done that and it works well. Works about the same as the vinyl, but I think it's a tad lighter weight. I think I used these Trim Sheets:
http://www.monokote.com/trim.html
Never tried using the stuff that requires heat to bond to the surface though.