I can weigh in on the Rubies Supreme costume. I got it for $250 off of eBay a few months ago and I'd say it's barely worth that. I actually have it as a placeholder on a mannequin while I do my build and it's passable from a distance but up close the armor doesn't hold up. I put the Hasbro Black Series helmet on it as I already had it and even though it's an ESB helmet, it looks miles better than the Rubies one (which also wasn't accurate to ROTJ). As you see in the image, it's just ok and no way I'd pay the $600-900 I've typically seen it priced at.