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I'm no gunsmith, but I've put together a bunch of them. I'll show you how to do it for you for nothing. Where are you located?
Wow. $250?! Anyone who knows what they're doing and doesn't fart around can build a lower out in 30min or so.
I would just build it yourself. It's easy, and it's a nice skill to have.
Watch the videos on Brownells site if you're lost as to where to start/what to do. I think the URL is HowToBuildAnAR15.com
Building an AR is far less complicated than putting together a common gas grill.
Building it yourself also familiarizes you with the gun and how it works, what can fail, how to troubleshoot and how to remedy it. It also builds self confidence.
I recommend building it yourself, its a win, win, win, win, win situation.