I picked one up at one of the various "7-11" type convenience stores that they have all around, it was ~ 5,000yen ($50) ... then when I go back it's 3,000 yen ($30) for like an hour of call time. Good for 2 months, then your number/phone expires in 6 months...unless you add more money. If you need help, I'd suggest PM'ing mjm as he might have some suggestions/help.