I need advice: Playstation 1 memory card for a PS2?

[GoPodular.com]

The wife and I are getting some PS1 games to play on the PS2.  According to Sony, it looks like a PS2 memory card won't work:

This Memory Card moves data significantly faster than the original memory card, but can only be used with PlayStation 2 format software.

So what's a good option for a memory card that will save both PS1 & PS2 games?  Is there a decent 3rd party one I should look for?

[whatzcrackn]

I dont think they make one?  I could be wrong but I was told this.  Go to your local game store and get some PSX for dirt cheap.  Blockbuster where I live had PSX's for $1.50, so I bought all six of them.

[GoPodular.com]

Do I have to worry about any not working with the slimline model PS2?  I've seen a couple auctions where it says certain PS2 ones don't work with the slimline model.

Of course for under $2, I'd probably buy it anyhow...

[yalborap]

A first party PSX memory card will work fine in a slimline. There's one in mine right now.