Most liquidators are prohibited from directly advertising from whom they are getting their supplies (hence you see things on sites like "Major Department Store #2" and "Online Retailer #4" etc.)
If the game is selling for more than retail on eBay and Amazon, that is usually indicative of a short supply of the game and is a temporary situation -- I'd avoid such situations personally, because the higher the price goes the more people are flooding in, and the short supply is usually fixed well before the online sellers figure out/accept this and lower their prices. It's a very easy way to get burned out of some cash, to try to chase them. You see this a lot on Amazon with certain toys, where sellers are simply buying them at the local Target and then selling them for well over retail online. It's a money trap that is far too easy to get caught in.
I don't know for sure, but Link hidden: Login to view might have ActiVision titles. They are one of if not the biggest wholesaler of video games, consoles and media in the world, so if they don't have AV then you'll need to contact AV directly.