SAMS has good prices only on some items. I don't know how many things I've priced at Sam's, then gone next door to Wal-mart and Wal-mart had the same item for cheaper. I've found that Sams actually overcharges on comparable items if you don't watch them carefully. For example, they charge $22.61 here for a 50pk Verbatim DVD+R/-R. That's not a bad price, but when Best Buy and other places put those on sale regularly for $19.99/ea., and with Sam's purchasing power...those should be about $18.00 normally priced, in reality.
Verbatims seem to burn best in a BenQ 1620 and 1640. While the PIE values are very good at 8x and 12x, the PIF is inexplicably high when burned in a Plextor px-716a...although the beta and jitter values are among some of the best I've seen. So, I don't think it's the media per se...it's the burner's fw. In case of the px-716, it needs serious improvement on the MCC003 write strat, although the BenQ1620 and 1640 nail it and give burns comparable to yuden000t02 or OEM TY.