If you took a gander at Virgin Mobile USA's latest Broadband2Go plans you might have noticed a bit of a hole between $10 a month for 100MB and $40 a month for unlimited data. Consider it plugged, with a new $20 monthly 1GB plan that starts today. That's quite a bit nicer than the previous $20 for 300MB plan, but of course there's a catch: it's available only at Walmart, and only to owners of a Novatel MiFi 2200 or Ovation MC720. W
