At Magic Kingdom on the right side of Main Street the store with the pins, watches jewelry. I think it is named Uptown Jewlers but that may be wrong. Loon on the left side of the store near the back door. A case contains them.
Also last year before the remodel Contemporary sold them in the gift shop on the side oppisite the monorail
I've bought a couple of pieces for my D-I-L, who collects Precious Moments, at the Art of Disney Stores in Epcot and also in DTD. The gift shop underneath the castle in MK also used to sell them, but I believe they're closed now.
When I was at WDW last December, they had them at a kiosk outside the American Experience at EPCOT. I wavered on the special editions and when I went back the next day, the tent was no longer there. I've regretted it every since. I asked inside the nearest gift shop and they said it was a special tent for the weekend (this was the second weekend in December).