These days you can get a USB flash pen that gives you unlimited PS2 saves, you just put them on your computer to store them.:
"MAX Drive is the all-new USB Flash Drive for PS2 and Xbox,
that enables you to quickly and easily use your PC's hard drive as a massive
storage space for your console game saves. Store surplus saves from those
overflowing memory cards, or even store back-ups of all your console saves
so that, in the event of your memory card becoming damaged or corrupted, you
don't lose everything. You also use MAX Drive to transfer Powersaves from
your PC to your memory cards, and even to transfer Action Replay MAX codes
to your Action Replay cartridge. To find out more about this revolutionary
device"
retail Price is about $29