...pre-order is available at amazon.com:
http://www.amazon.com/exec/obidos/ASIN/B00005ML6Y/thesimpsonsarc0f/102-4021357-5138522
The price is good ($30), but they're release date is Oct 1 (as opposed to Sep 25). Personally, I'd wait till buy.com has it for preorder, because buy.com will usually ship videos several days before the release.
-- Rick