I just saw the 5W-40 synthetic at Wal-Mart this morning. It was under $20 gallon. They also had the regular Rotella 15w-40 in a 2.5 gallon jug for $25 and change.
2010 Silverado 5.3L
Crew Cab 4X4 Summit white
very Short Bed! HD towing, trans cooler, HD cooling
2002 DMax CC Long Bed Pewter SOLD @ 122K 1/1/11
Westin Steps, Rhino Liner