DBA has a number of rotors for these trucks on closeout. They're the wiper slot design, NOT drilled for $96.11 each. Considering they retail for $170+ or $140 on some of the cheaper sellers (inc ebay) I found this to be a pretty good deal.

DBA 4528SL 4000 Series 6x6 Wiper-Slot Left-Hand
DBA 4528SR 4000 Series 6x6 Wiper-Slot Right-Hand
DBA 4093SL 4000 Series 6x6 Wiper-Slot Left-Hand
DBA 4093SR 4000 Series 6x6 Wiper-Slot Right-Hand

I was quoted $53 shipping to VT (warehouse in OH) which brings the total shipped cost per rotor to 109.36 which is still well below market price.

Thought I'd give everyone a heads up if you're doing your brakes soon!