You can find HP 128MB simms on eBay every now and then that work with the add-on scsi module. They don't fit the normal simm on the Blizzard board itself, because the slot is parallel with the board and the 128mb simm is too tall, hitting the 68030 chip and some ICs so it can't clip in. You're best bet is to find a double-sided 32mb or 64mb simm, which are short enough to fit the single simm slot on the Blizzard board.
