exactly! prints are the most expensive part of the process, and then you lose in resolution and quality if you scan from 10X15 prints, i guess... i don't know what ebay prices are, but the last time i bought 30 rolls of kodak gold 100/36 for $1 a roll, and before that i found past expiration date agfa 400/36 film for $0,26, but that really was a rare chance, and i missed it.
i'm a translator, i take 'projects' now and then. but i used to work in the office a few years ago, it was very much like hell.