For those Canadian Bronies out there, apparently a store called "Zellers" has finally started carrying these. Unfortunately I do not live in Canada so I'm screwed.
They are $2.99 each, and apparently really freakin tiny (like a little more than an inch high). I don't know how accurate that is, but $2.99 for something that small sounds kind of crazy, even if ponies are involved.
Apparently Zellers is the Canadian version of Target, so hopefully we will see these in the US soon.