UK/France/Spain and most european countries have got good deals. Under 40$ a month for all unlimited, and many MVNO offer 4 cent/minute or text and a fixed ~20cent per call rate, pay as you go (data is very cheap, too). Inbound texts or calls are of course free (except when abroad).

Roaming is currently around 9ct/mb in the european union if you manage to get the right deal, or by law 80ct/mb which isn't _that_ good.