Thorgi Duke of Frisbee

Well the 3G game limit is 20MB, UMDs are just shy of a gig, so the bigger games on Vita could be a couple gig each (though not all games on PSP ever hit the 900MB capacity). As it currently stands you can fit a few dozen PSP games on a 4GB memory stick.

I think the price will drop quickly as it does for any flash. It's hard to fairly compare cards though - these are the size of a MicroSD, but when MMC cards died off, SD became the simplest format, so of course it's cheapest. It's been more fair to compare MS to CF, but I don't think there is a fingernail-size CF card with extra security now... TL;DR, Sony cards are a bit more, but it's been ages since it was uncalled for.

So after a proper look at PSP games, most hover around the 500MB range, those exceeding 1GB tend to be RPGs or the "AAA" 1st party titles.