Over at Chestnut Ridge Knife Shop [they have a sub-forum here] have a few factory second Ontario blades that will fit w/in your budget. For instance, you can buy a Marine Raider [SP-10] for $34 + $7 shipping = $41. I purchased one a while back and it's flaw was the edge wasn't that sharp. I took care of it in ~15 minutes. There's also a smaller Kabar style Marine knife as well as a stainless "diving knife". If you look around, there may be other FS knives over there or in fact anywhere. If you are on a budget FS may be a good option. Many knife websites sell FS.
Someone mentioned Condor. Knifecenter has a bunch of their stuff in stock that may fit your requirements. I don't have any of their smaller blades, but I sure like the Golok. I understand some of their newer 2011 designs are quite interesting. They aren't out just quite yet.