Just the DVD/Blu-Ray combo packs of the two Despicable Me movies (including a special release, with a villain handbook, produced for the Target corporation:
http://www.target.com/p/despicable-me-2-blu-ray-dvd-digital-with-digibook-and-bonus-disc-only-at-target/-/A-14927564) and a gray Despicable Me t-shirt with the following official art on it:
I'm not really a collector type. It comes across a bit too geeky for my tastes and interests. But that's me. It doesn't necessarily bother me so much that others do it...unless they're adults (young or otherwise) who get into collecting so much that they deny those products to children...for whom the products are actually DESIGNED, and by whom they are meant to be played with. Not kept locked away, untouched, inside "the original packaging" and "in mint condition". To me, that's just weird. They're toys.