If I'm you, try speaking with a vault manager at whichever branches you go to that has coin machines. State what you're doing, and that you'd like to purchase bags. Ask if they can say when they transfer coins as well. My CU prefers I do bags to rolls to save on waste paper and time on both ends. I pick up and dump at the same bank, haven't really had any issues, as they were nice enough to tell me their schedule. I exchange coins the day before the trucks take them away each week. I basically get all the cent bags they have on that day, then over the course of the week work through whatever else I want. If I get dimes one day, I know I can only get them again when I dump, otherwise the well is poisoned, so to speak, for the rest of the week. After a week, I just repeat the process. Now, mind you, I work in mainly cents, so this is quite do-able, having bags of cents laying around for a week is a LOT less expensive than dimes. Guess that depends on volume and whatnot. Maybe you could start off at a bag a week, then work your way up if it works well on both sides or something. But thats all I did and its worked for a year so far.