Most libraries that had patrons using notary services offered those services on evenings and/or weekends, and didn't have many places locally where people could get paperwork notarized. Most charged a few dollars per signature, and some didn't charge at all. A few people pointed out that notaries are personally liable if they make a mistake while notarizing documents, so I don't think I'm going to pursue that at this time. One library had a lawyer who was also a notary offer to volunteer one evening plus one weekend a month to notarize documents for patrons, so I might consider something like that in the future. Thanks for all the responses!