I don't know. I guess I have a way of doing it and it works pretty much every time. I think I have bought 5 or 6 prints from flippers, a few times because I got stuck on Mondo's site, other times because I couldn't physically be in front of the computer. And no, I don't spend hours refreshing. I own 200 prints from Mondo exactly, so 5 or 6 fails is not too bad, I guess.
T