I've been on the hunt for a great DVD deal for the Stanley Kubrick set. Going to the "well", I find that my favorite DVD purchase sites have them for at least 150 bucks. But www.dvdpricesearch.com brings up these websites: www.playcentric.com www.northamericandvd.com www.directvideo.com etc., etc. They advertise the set for close to 100 bucks. How reliable are these websites?