I was on the BBTS site on the weekend, and the 3rd wave of Power Battlers were in-stock, so I had a look to see if there was anything else new to buy at the same time. I found three other items and started carting them... but when I got to the Power Battlers set of 5, they were suddenly out of stock, and haven't been back in stock since.
I guess I should have carted them when I saw them and then went off to look for other new items.

Ah... snooze you lose.