T-Mobile (or their wholly owned metroPCS MVNO which rides the same network) has plans which are "unlimited" up to about 50GB/month of usage, for a lot less than $200/mo... It's not a lot, but can be stretched pretty far if you're willing to refrain from watching a lot of youtube and netflix video. It used to have a 22GB soft-cap limit after which it rate limited to 128kbps x 128 kbps, they recently changed it to 50.