I've got my A-TACS Propper ACU (ACU, or Army Combat Uniform, being the style pattern of the uniform, ARPAT or UCP is the camouflage pattern) shipping May 25 (yay preorder) and I'll be converting my entire kit to A-TACS. I'm also ordering in 500d Nylon to make some custom items for myself.
I've managed to source almost all accessories for everything thusfar:
http://www.predatorbdu.com/categorie...System-A-TACS/
http://store.tactical-performance.co...outerwear.html
http://www.tacticalassaultgearstore....wproducts.aspx
http://www.lapolicegear.com/a-tacs-p...irts-camo.html
The only things I've not found were small things like gloves, face wraps, knee/elbow pads and helmet covers. They'll be inbound shortly, but for the time being they're not in production. The above list is just minor compared to the list of stuff on the a-tacs site, but it's the ones that have everything for sale you could need. I'm looking into getting nametapes made and if I can confirm that, I'll source you guys a nametape company that'll do them in A-TACS.