The AA kit is very old and if it is anything like the one I have, not worth the money being asked. It is in the same vein as the Striker that John did a build thread on:
Gecko have announced a new Scimitar with a release date of Feb/March. Rumour has it, they have plans to expand into the other variants like they have done with other kits in their range, despite the difference in hull size, so you may still get a styrene version if you (we) are lucky.
Pre-order price for the Scimitar TES in UK is a whopping GBP 45, but Hobbylink Japan has them for around USD $50 / GBP 37, so if they do release one, that will be the price range I expect.
Scimitar release was announced here: