The one you are most likely thinking of is the 5gb broadband access plan. It is 59.99/mo ($2 a day) for 5gb of data transmission.

There is one that is 39.99, but it is only 50mb of data, so if you actually plan to connect to the internet more than once a month, you'd be best off with the 59.99.

If you have a smartphone with a data plan, you can tether it to your computer. Take your dataplan and subtract it from 59.99 and you have how much it will cost.