Free: Contests & Raffles.
Cabelas Alaskan frame pack maybe? Or something used like a Dana Designs Terraframe or something along those lines. Horn Hunter is a good lower priced pack but not sure that you'd get that low priced. You could probably find an ILBE military pack for that money.
Kelty red cloud 90, it's a couple hundred bucks and not a "hunting" pack but works well for me