You can still
buy 30pin simms (256k, 1mb, 4mb) from JDR. the 4mb parts are
scarce and finding them for less than 10$ is hard. The 1mb parts are like
flies and they can be had for nearly nothing.
And don't forget the 16MB ones... One of the Macintosh catalogs has 30-pin
SIMMs really cheap, but I don't remember which one. MacWarehouse has them
from $20 for 1MB to $160 for 16B. MacMall(which carries Viking memory) has
2MB for $20 and 16MB for $50(and a 32 pin??? 32MB for $60)
Now that is absurd pricing. Data Memory Systems will sell you a 30 pin
16 meg simm for $29, not that absurd $160 you mention. 4 meg are $10.