Well, looks like I'm the lucky duck to snag the TRU exclusives first... Here are some pics of my Minimates collection so far.
4-Pack:
Courtroom Peter and Washington Square Ghost:
Gooey Ray and Exploding Stay Puft:
Egon and Library Ghost (note this is the same Egon from the 4-pack):
GB2 Winston and Terror Dog:
Slimed Peter and Slimer:
I will say, I'm not impressed with TRU.com's shipping method. They simply put the Minimate boxes in a padded envelope and mailed them. I had ordered 2 of each set, to keep one in the box... so luckily 1 of each wasn't damaged. None of them were horrible, but a few of them were slightly dented.
I'd have to say right now, my favorite packs are Gooey Ray/Exploding Stay Puft and Slimed Venkman/Slimer... definitely very cool, and very "GB".