Do you have friends in Canada or Mexico? (Or India, Europe, AU etc ... but be careful, they use different concentrations over there). That's one way.

Also, Wal-Mart has insulin for cash $24 / vial. Novolin R, N; not the fancy lyspro fast-acting analogs, but with some discipline it works. I've been on that for years after developing allergies to the analogs. The companies often have programs to sell them cheaper if you're uninsured or poor (i.e., to keep you from being sympathetic in the nightly newscast). Their policies are geared to steal money from insurance companies, and give an out to people. Definitely worth a call.