I also collect these paperbands, which hold a bundel of 100 banknotes together. I would also be interested in such bands from different financial companies/banks from the US. The third thing I collect are drive-up envelopes from different banks. I don't know if they are realy called "drive-up" envelopes, I just read this word in the internet. These are envelopes you can get when you go to a bank counter and get cash from your account. Mostly there is an advertisment from the bank on this envelopes.
By the way: Sorry if my English isn't perfect. I try to use my English grammar and vocabulary skills as good as possible. I just learned it at school and am not a native Speaker.