There's a thread somewhere discussing this, but I've been using Altitude Steel near Colfax and i25. They usually have a pretty decent scrap selection as well.
Horribly Painted Moonglow '95 FZJ80 Has Some - Still Needs More!
White 2008 GX470 - Nearly Stock
"I drive an ECO-FRIENDLY FZJ80...It's got a salvage title which makes it a REPURPOSED/REUSED/RECYCLED vehicle. Therefore, don't mess with me when I park in the "Reserved for Green Vehicle" spots in Boulder!!!