You only need ONE USB dongle, so long as you get a new IP each time you log in (make sure you log the IP's). Im not in the US, but you just need to get a provider that offers dynamic IP's, which change between unplugging. I've heard that T-Mobile USA do this, but can't be certain. It would also be good idea to see what provider offers the best coverage for your area before signing up for a new contract or check the pre-pay deals available.
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