bambaland is the official online store for threeA and Ashley Wood. Their production runs are very limited even compared to other niche toy companies because, generally speaking, they only make what they can sell via preorder (and that number is predetermined, more or less prior to sale). Sales are announced periodically, as Ashley Wood and the design team at threeA see fit. You'll need to subscribe to their newsletter and/or keep tabs on the official blog to find out when the next figures will be put up for preorder. Preorders that are exclusive to the bambaland store stay up for a short period of time. Some times a few days, sometimes a matter of 24 hours depending on demand as there is a set number produced of a particular figure or figure set.
As for 3AA, that's a special membership club that's offered once per year (for a fee). In addition to a special member's kit (includes a fig, clothing item, and other little goodies), you also get the opportunity to purchase an even rarer variant of whatever exclusive fig is put up for PO at bambaland, as well as a 15% discount on purchases through the store.
You can check the BST thread at kidrobot for better than ebay prices, although once figures sell out, they tend to command 2 to 3x more than the original price even from other collectors due to the scarcity.
Best course, IMO, is to wait for new figures and buy them at MSRP. The prices at bambaland include shipping, so they are pretty good deal. AW has already confirmed there will be new AK figures announced this month. This week, Rehel will be the newest preorder exclusive to bambaland.
I'm not as sure what their retailer plans are. The most recent retailer exclusives have been delayed for kind of a while now...
