The 3 Battle Call Troopers size-class (wave 1 Bumblebee - Wildwheel - Meteorfire) were in-stock on Amazon yesterday and today (I was able to buy all three).

The links are at Amazon Australia, but it is US stock from Amazon America... for AU$40 each.
These haven't been found at retail anywhere in the world yet, so these are a first, and they have electronic gimmicks to them.

(ignore the names at the top of the product page and address bar for Wildwheel and Meteorfire, as we sometimes get the wrong names listed for these import listings - someone at Amazon Australia who does up these import listings, will often have abbreviations (see Bumblebee's page title) or the codename, or a completely wrong name)