I got an email tonight saying it was back in stock, so I put in an order. Seeing that shipping was $8, I decided I should pad out my order and waste more money. (I ordered a Pikachu character hat and Pikachu hand puppet.) I checked out just fine but my receipt says the GBA is "out of stock." So either they didn't actually get new stock in (late night website error), or they all disappeared in those short ten minutes I spent looking for other "cheap" things.
UPDATE: My emailed receipt says all three items are "in progress," and the total payment includes the price of the GBA. I don't know why they'd allow the item to stay in my cart, let alone check out and order one, if it became out of stock. We'll see how this goes.