Yep, I buy HP5 in 30metre rolls and load it into canisters myself, it usually works out at least a little cheaper. Some people complain of the loader scratching film and all but really I think that's more paranoia than anything else; I've been using it for over a year now with no problems at all. And it means you can decide on how many frames to use, I fin d that useful. Don't know much about buying 10+ rolls at a time though, only that well known auction site where people sell lots for a bit less than the shops.