I know this used to be a costume unlock if you made the item using the old arms crafting piece. Is there a way to get it now with the new system? Here is the piece:

http://www.champions-online-wiki.com...ged_Tech_Sleek

If its still in there, where can it be found/bought?

I rushed to create as many of the crafting costume pieces as I could before the patch went live. Unfortunately, that was one I didn't have enough mats to make any more of.

I hope they do make the crafting costume pieces attainable through other means - I want the blaster quad and chest pieces.

afaik, they've stated they will go back and add some of the now-missing items in at some point.. How, where, and when is a horse of a different color, however, and I'm not entirely sure I want to speculate on the specifics there. :/

But, I really do hope they get them in-game again soon. :( There were a few Mysticism bits I was saving up the parts for that I never got finished.