I wandered into the Gander Outdoors just off I94 on Westnedge in Portage near Kalamazoo over the weekend. I saw ,amid all the bikes, running shoes and Kayaks a gun department with a few guns available. Nothing caught my eye until I got to the case where some stripped AR15 lower receivers were displayed. Anderson lowers were $49.95 ea which I thought was pretty reasonable. Uppers with no bolt carrier group were about $400 in a couple of calibers, which I thought was a little high. The guy said they had parts kits for the lowers but I did not see any. He also said they were out of buffer tubes. I do not know for certain if they had enough parts to assemble a working rifle, but I think you could get a good start on one all in one visit. I need to check on the one here in Saginaw.