Yankee Hill Machine sells a few that are less than that, and some that are slightly more, depending on what you are looking for. Quality product from what I have seen. If you are just looking for a free float tube and not a free float rail then DPMS makes a $50.00 one you can usually find at Midway, they also offer a carbon fiber tube for under $100, though the glue on after installing idea seems a little stupid to me.
If you are in the PDX area give Curt's Discount Shooting Supplies a try. Great guy to deal with. He will be at the show this weekend as well.
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