I just pulled it from my brand new old Pismo. 256MB PC100 SODIMM M464S3323BN0-L1L by Samsung.
It will likely work in any iMac or powerbook that requires a Low profile SODIMM PC66 or PC100. It's not PC133 as far as I can tell.
$27 shipped OBO.
Actually, I have two of them, but one is still in my machine. I will sell both for $50 shipped together.
If I don't get any offers in a day or two, I'll list it on eBay where people are insane and will pay anything for anything. Idiots.