Some things were just meant to be bought at the 99-cent stores! Assuming you have some near you. You can also buy other schtuff real cheap, (well, 99 cents), for this hobby-- tupperware in every imaginable size/shape, etc.
I just wanted to say that in the case of rubber bands I will hit the office supply store before any dollar store alternative and I think we discussed this here before but I'll explain anyway. Bottom line, a higher quality rubber band is worth the cost (imo) in savings to hand happiness. Cheap rubber bands (in my experience) break more often and it is painful. Few hours of folding up shirts and those snaps really accumulate in terms of pain.