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I get mine done at NTB, 3 year alignment deal so I get as many alignments as I want for free. It costed me $100 b/c i had a hook-up, but for normal price it's $120 and $210 for special vehicles that are lowered. But sometimes they will overlook your suspension or you can just smooth talk them into give you the normal car pricing deal. 4 months later and I've already gotten my car aligned 5 times (I am always making changes to my suspensions) while costing me only $100. Of course they don't give the best alignment jobs, but it's cheap and they do a good enough job so you aren't burning too much tire and your steering is straight.
EDIT: If you go to the one in merrifield, off of prosperity rd, ask for Jeff he's good with working on modded suspensions. and has a lot of experience.