Consult the Nepleslian Black Market for buying anything short of their newest, top-of-the-line powered armorsuits and armor-grade weapons. The exact list, though, is subject to debate...if you're interested, look at some of the submissions like the WATER 2 or other Element models, make a list of what you'd want, and then ask me; I'll tell you if it's available or not.
I've been wanting to kick off Nepleslia's Black Market, so it'd be helpful for the both of us.