Hi guys, I'm the owner of the above linked blog (thanks for all the search hits, btw!). I'm not affiliated with Orange04 (mephitis.jezebel) or AVentity, but I figured I'd just link y'all to the CURRENT Chimera location, as the store moved recently, specifically where the AVentity avs are. The SLURL may just put a beacon up for you, I'm not sure if direct teleporting is turned off or not.
http://maps.secondlife.com/secondlife//21/49/3489
And for the vendor, speaking as someone who's used it many a time, pick your species, then color, then right click to "Pay" it.