They have SRAM cards on the same site
http://www.synchrotech.com/products/sram-pcmcia-pc_cards-01.htmlBut I'm not sure if those are compatible, but they seem to be. Only up to 4MB will work with the Amiga, so it'd b best to grab one of those. Provided they're compatible, they'll be configured as FastRAM by default, or you can use PrepCard to make sure of it. On an A600 you'll get a very small speed boost, on an A1200 your system will slow down, but have more RAM at least.