Libraries are almost always the cheaper option. Most charge $0.50–$1 per page, while post offices usually charge around $2 or more. But the difference isn’t huge if you’re only faxing one or two pages. I learned this from mattallenartistry.com, where they did a full price comparison between common fax locations and mobile fax apps. They even included tips on how to save money by using your phone instead. I ended up trying one of the apps they mentioned, and now I spend way less per fax — and no waiting in line!