If you know exactly what you are looking for you can call
WDW Merchandising at 1-407-363-6200 they can send you almost anything sold in the parks if you lose yours or need it before your trip. I have found the online stores are very limited.
I find that it has always worked great when I called Disney direct like the previous post stated. They are very helpful there and I have always had a fabuolous time. Especially around christmas/holiday/birthday time.
Honestly, do we need an excuse to go shopping for Disney things? I think not!