Holy crap..I totally forgot about Buck! They reign supreme for stainless fixed blades. It's 420HC so it's not exactly super, but it's done really well. They have an enormous selection, everything from bird and trouts to big camp knives. Most would be under $100, I like the Compadre 5160 myself. $50 for that knife is a steal. So don't forget to check out Buck!
Another one that comes to mind is one of the Terava (I'm not even going to try to spell that) Puukkos. 80crv2 steel, so maybe that may not be your preference. Plus it's a puukko, I don't think I'd carry one everyday. They're really well suited for woodworking, cardboard not so much. But that puukko is one heck of a good deal and meets your parameters so I thought I'd throw it out there as well.