Originally Posted by kevincrumbs

The equivalent to SUICA/PASMO/etc is T-Money. Even though my recent trip only involved Seoul, you can use and reload T-money in Busan. We loaded 30000 Won for a six day stay in Seoul and it was just enough to get us by. We didn't use our T-money cards for anything except for transit so if you start using it to pay for snacks at convenience stores, you'll end up burning through it a bit quicker. I don't see the benefit in purchasing the card in advance, nor do I think it's possible. If you want a card, buying it from a convenience store at ICN/GMP would be the way to go as we ended up buying dongle versions of T-money from a vending machine. YMMV.