I haven't loked into an eye-fi yet, but can you set it up to connect to your phone? Then just bring a phone-to-computer cable/charger to charge the phone and transfer data if needed via a library computer.

Places to link up are coffee shops, Cracker Barrel restaurants, maybe Denny's, truck stops. Just some ideas and thoughts. Thinking about it, I believe some handimart type gas stations are starting to have customer wi-fi.