An easy way to get those manufactured weapons without using up your hands or spending a feat on Improved Unarmed Strike (although that'd be my route) is to use spiked armor. You'd have three spiked armor attacks and two claw attacks when full attacking--although if I was doing this, I'd ask my DM if I could reflavor them as boot blades or some such (which are available, along with elbow/wrist/knee blades, in Complete Scoundrel, but they're a hidden/backup weapon and you take a penalty when using them).