convince some people/small companies to get it, and offer to set it up for them free. Then take note of their logins and pass, and come the end of the month check to see how much they have left and use theirs

I got 2 clients with ADSL that use less than 1GB. So thats 4 more to me

granted it's not very ethical, but I never kill their cap so they never have a problem and I get extra.