It should be obvious why gamestick was cheaper. Its a got a far smaller physical footprint than the ouya ever did. For one it was basically the size of a usb memory stick with cost effective components and chip from which the OS ran off of. Second the gamestick wasn't using any sort of chip sets that would drastically set it apart from other android consoles. For the most part gamestick used middle of the line processors and such. Ouya on the other hand used a nvidia tegra 3 chip. Old chip or not at the time that alone drove up ouyas price point. It also lacked a ethernet port, which the ouya has.
Now the above has nothing to do with what you saw at gamestop or their website. Gamestop is simply liquidating whatever stock of gamestick they have in a attempt to not get stuck with something that pretty much won't function as intended after january 7th ( I believe that's the date service will shut down in all capacity for gamestick). It's pretty much a loss for them either way, but selling them at $10 for the console and $1 for controller will net them a lil something from it. They did a similar thing while ouya was still prominent, and announced they had to fold. When that was announced and the date drew closer you could find ouyas on sale at physical stores anywhere between $20-$40 if not cheaper. All depended on the store that had physical stock of the ouya consoles.
On to a third point of interest. Only thing essentially keeping ouyas prices up high now is the fact that razer acquired their software properties, and essentially re-made the discover store for their forge console in the form of cortex. By doing this they also pledged to keep the servers open on the ouya discover store as it uses the cortex server, and seemingly allow new adopters of the defunct console to make a razer id to function on ouya on that store. The store wont get anymore new games, but the library of games it has is still accessible. The ouya page for making new ids redirects to razers id creation page indicating this possibility, though it's unknown if that's the case, as there was a recent thread of a new ouya adopter trying to get access to the discover store, but having no luck in that endeavor. I personally directed him to ninjajebus who is a ouya publishing rep at razer to see if anything could be done. Whether or not they were successful is largely unknown as they haven't posted since then on whether they had any success. That and razer seems to offer no guidance on how to do so with the discover store even though they essentially own and operate the store and server it's on.