I agree with the others, simply get yourself the tools from Brownells and assemble it yourself. It really is easy to do and rewarding as well. But if you don't want to do that, you can probably search your local area for a gunsmith that can put it together. From my experience, the cost of gunsmith assembly of a lower rivals the cost of the tools. It only gets costly if you start into uppers and don't already have a foot-pound torque wrench, otherwise all you need is a few punches (roll pin and standard), small hammer, a receiver block and vise (done one without, not recommended but possible), receiver extension wrench and an assorted bit driver set. The Brownells instructional assembly videos are very helpful for those starting out. Patience is necessary with those pesky ass take down pins, and be careful when driving the trigger guard roll pin that you don't shear off the dog ears banging too hard when it's not aligned.
AR's can be addictive so this probably won't be the only lower you get, nor will it likely be the last time you will want to tinker with it.
