I was recently in the market for some Ameriglo Pro-Idot sights, and a google search sent me to slimstacticalguns.com . They had a much better price than any of the other sights I checked, and their prices on Magpul AR stuff was good to. I have since added them to my "always check with" list when I need gear.
I assume they are somewhat knew since I'd never heard of them previously, and it seems that they are tied to ManVenture Outpost. (I however am not tied to either company or site, I just appreciated the value and fast shipping enough that I thought I'd share)