Advanced payment options?

[Bixby]

There are 60-day game time cards available for NA now.

You do get a discount for 90 or 180 day subscriptions. It's $1 off per month for 90 days, $2 off per day for 180 days (and the same if you pay with Crysta). Those are only available as recurring payments, but you can do so with either Crysta or a credit card. Really, the only difference between using Crysta and using a credit card is that you're using Crysta instead of a credit card.

You won't get these discounts with game time cards, since they add a flat 60 days to your remaining time and they're at a fixed price.

[Niwashi]

Those are only available as recurring payments

Well, they initially default to recurring payments mode, but you can turn that off any time you like. Go ahead and buy 6 months worth as though you were setting up a recurring payment, then just cancel the "recurring" status of it as soon as the first payment goes through.