Can someone send me a link to an airsoft gun?

I'm looking for a gun for $50 or less. It should be sturdy, have an FPS of 250 or more, and most importantly, be able to hold a ton of BBs. I'm talking like 30 in the magazine and and like 500+ in the storage chamber. The BBs should automaticlly go from the storage chamber to the magazine. It can be spring or electric. Can someone send me a link?