Define "inexpensive". :D
I would expect to pay at least $300 for a new rod from a good builder. Two very good builders are Dave Lewis:
http://www.performanceflyrods.com/glassrods.html
... and Mark Steffen
http://www.steffenbrothersflyrods.co...rglassrods.htm
The Diamondglass rods are also very good and are similarly priced.
For less $$$, you might be able to pick up a good used rod. Check out the "For Sale" section here.
http://fiberglassflyrodders.yuku.com/
I'd also check ebay.