Welcome to the forums.
I haven't been here that long myself so I hesitate to sound like I'm an old hand, but I see you're new so I just wanted to welcome you. There are a lot of friendly and knowledgeable (and totally freakin' weird) people here, and I've been enjoying it. You can get plenty of help if you get stuck in a game, too, which is why I came here to begin with.
These guys (link below) say they have 51 copies in stock for $14.95. They seem to sell used stuff, as they sell games in sleeves marked "not for individual sale" and whatnot, but it says these are "retail boxes."
I have browsed their inventory many times but I have never purchased from them, so I don't know if they're reliable. They say that they've been in business for 8 years. I'm going to be buying AE soon myself, so if you do order from them, please let me know if you have any problems with them.
Thanks.
Link:
www.cdaccess.com