You know D, those also came packaged as sets for Universe in more G1y decos. They might not go for as much as one would think.
If I may give a little advice on Con-ing and shopping dealer rooms. If you have the gumption to try, you shouldn't be afraid to haggle with these folks.
I cleaned up pretty good at that last BotCon and made off with some pretty great prices on things.
The easiest way to do this is to try to make bundle deals. Find a vendor that has 2 or 3 of the things you're after, and make them a flat offer for all the items. Go lower than you are willing to pay. See if they bite. If not you have room to work up to the price you'd be willing to pay. It works! And nobody gets hurt. The prices on these things are set on perception only, and vendors are there to move merch.
Also remember that cash is KING! A vendor is way more willing to budge if they see a fee free wad of cash in your fist!
Happy hunting and have a great time!