Prodisc can be good, but lately they've been using MCC codes on their media, and it's screwing things up on some drives. Personally, I don't like Prodisc, but I've only tried it on one or two drives, which just didn't happen to like it.
As for the deal, other then the one time that I saw 50 Prodisc 4x DVD-Rs going for $19.99 CAD, yours is the best I've seen.
@whitelude:
it was
www.cty.ca that had the deal on Prodisc's for $19.99 CAD per 50pcs. It's over now, but they might do it again sometime? 50pcs is now $26 CAD