I have a MBP, iphone, and ipad. I'm thinking of getting an 11" MBA to use instead of my ipad. I think I would like it better in all ways except losing the 3G. With my AT&T ipad, I can pay for my data every 30 days and just cancel it when I don't want it. Being that I probably only have it active 1-2 months a year, is there anything out there to do this with a MBA?