We got a bunch of our stuff at thinkgeek.com. Been using them for years for geeky/nerdy gifts!
Geekling Designs is awesome too
www.geeklingdesigns.storenvy.com :)
Try zulily. Check each day they have some and its even clearanced.
Thinkgeek.com it has baby stuff as well as amazing nerdy stuff.
Thinkgeek.com, perpetualkid.com, etsy.com all are good places to find nerdy things for all ages including baby.
Exactly what I was going to say! :-)
Google it! Haha my boyfriend plays counter strike and I got him a few tshirts from red bubble. I never thought id find anything counter strike since many people don't know what it is. (A video game)
There are a few things on Amazon, but you'll find a ton of stuff on Etsy.
Spencers? Other wise google might be a big help :)