i know MR makes great ROTS clone helmets, but does anyone (other than Rubies :rolleyes) make GOOD AOTC helmets? i can't seem to find anyone that makes halfway decent ones.
If you're looking for a replica collectors' helmet, I don't think there are any. Yet if you're looking for a Clone helmet to go with a set of armor, then you can try http://forum.clonetroopers.net/
clonetroopers.net is good, but i'd suggest clone-empire.com. it's a lot more active than ct.net. it's not an official 501st board (just like here), so it has some different rules, but there are some good people doing that there. check it out.
and yes, it is possible to get an aotc clone helmet there.