In the Polish webshop of RetroAmi you can preorder a PCMCIA-card with 4 MB Fast-RAM for the Amiga 600 and 1200. It is equipped with SRAM ICs with 55 ns access time. This is supposed to boost a standard Amiga – according to SysInfo – to 1,67 MIPS (screenshot).
The card will be delivered at the end of August and costs about 50 Euro.
Website: http://retroami.com.pl