Geek & Sundry, the DeviantArt tumblr and twitter accounts, and 9gag.
A lot of people emailed/messaged me to ask about buying prints of it, so I thought I'd post that info here in case anyone else is wondering. I no longer sell prints online personally--I couldn't make the economics work in my favor--but I have enabled print buying on several of my Deviant Art pieces, including this one. If you look to the right of the image here, there's an "add to cart" button. If you click that, you can get started on buying a print from DA. I've never bought a print from DA, so I can't vouch for their service/quality, but it's simple and the quickest option, with a lot of available sizes.
Option #2 is buying a print from me at a convention. I make sure to stock prints of this drawing for every show. I usually make 11x17" prints, but I might try more sizes this year. I sell them for $20-25, and I'm happy to sign/personalize them. Here is a list of my 2013 conventions.
Option #3 is for anyone in Portland, Oregon. There's a print shop called TIS that works with my studio, Periscope Studio, and sells prints of our work in exchange for printing benefits. They sell 11x17" copies of this print for $20-25.
I have also had several inquiries about commissions. I am not accepting commissions right now, but I will open up a limited number of commission slots on February 1 (and I'll post info here about it on Feb 1). Those are only for people who will be attending Emerald City Comicon and can pick up their commissions in person at the show.
In other news, I can't stop listening to this song: