My local Texas Game Stop stores have received The Black Series 6-Inch BT-1 (Beetee) and 0-0-0 (Triple Zero) Droids over the weekend and they were just put on the shelves today. These are also in stock at GameStop.com as of this post. You can also use the product pages (see links below) to check your local stores for availability.

TBS 6-Inch 0-0-0 (Triple Zero)
TBS 6-Inch BT-1 (Beetee)

As for the rest of this wave, GameStop.com lists them as a "Preorder" with various release dates this month.