Watch the fine folks on this site in the Buy and Sell Gear topic and maybe you can score something slightly used like it did for $100 or less. I ended up with a Six Moon Designs Swift. It is the older version at 18oz but it carries nicely and was pretty well priced. Got my base weight down to 12lbs with that purchase so it is always worth checking. I'm pretty happy with the Swift as I carried 24lbs all over the Sierra Madres last January and it performed very well even at that weight even though it is rated for 20lbs.
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Listen to the trees in the wind