T-Mobile has the T-Mobile Rocket 4G Prepaid Data Stick for $20. Includes free $15 prepaid data refill card with purchase. Features microSD slot with up to 32GB expandable memory. 
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And it looks like that $15 gets you 300 MB (or just under 1% of the 32GB card it supports) of data to use in a 1-week time span
For comparison, your first 100MB on Ting cost $3, or 500MB for $13.
And? I have Clear wireless and pay $35 a month for UNLIMITED usage. I have the lower cost plan and my speed is supposed to be capped at 1.5 Mbps, but Speedtest shows 3.0 Mbps most of the time. Netflix, Amazon video, etc. are work fine. I cancelled my low speed DSL in lieu of Clear. Sure, it's not nationwide, so what? I don't travel that much that I need nationwide coverage, I can always use free wifi when traveling anyway.
to be honest, my T-mobile 4G cell is very disappointed, it takes forever to install android apps via 4G, I always need to connect to a wireless network to install new mobile games.
My T-mobile 4G connection is impressively fast. I tether my phone to a XOOM and the speed is comparable to what I get from my home router over WiFi, for most types of browsing.