$25/mo, no contract, unlimited data, 4G (6mbps down/1mbps up), up to 8 devices tethered at once, 150ft range (that's half a football field!), and best of all.. It fits in my pocket.
Mobile router costs $99 normally, however, if you catch it on sale, you can snag one for $20. (they ran 80% off specials during Thanksgiving weekend, and for five days last week)
Cox Cable feeding a Linksys E3000 router. Real fast and I always have at least three other devices online with it. Never had a problem, even with up to 4 of us streaming at one time.