I am in Halloween LOVE. This is the latest Disney/Dooney & Bourke collaboration, and it's available for sale as of tomorrow, September 13 (yep, that's Friday the 13th).
This wonderfully creeptastic bag retails for $330 USD (comparable to non-Disney D&B tassel bags) and it will be a park exclusive, at least initially. The plan is to make it available via the Disney Parks online shop "later this fall" (no date yet). Here are the locations where you can buy it in the parks:
The Walt Disney World Resort (FL):
While there is no official word on this, if you just can't wait for the bag, it might be possible to call the stores and arrange for mail order. I've also heard this isn't strictly limited edition, so here's hoping selling out won't be an issue.