In the "way cheap" market, Cold Steel's Frontier Hawk is good. They're tough, light, inexpensive. You'll want to re-work the edge, which comes dead dull, and I like sanding off the paint, convexing the edge, bluing the steel, and staining the handle to a real wood color. They're about 18 bucks plus shipping via eBay, etc.
For high quality, hand-forged tomahawks, it's hard to beat H & B Forge. They'll sell you a full-sized, hand-forged-in-Ohio 'hawk (try their Shawnee, whcih is their classic version), with the head made by forge-welding a hard, high-carbon cutting bit into the softer steel that makes up the rest of the head. I hear these are a bit thicker than the Fort Turner 'hawks, but the quality is great. They'll set you back maybe 40-50 bucks.
I'd stay away from the CS Rifleman's 'hawk--as mentioned above, it is hugely heavy.