Here is the much sought after part number for the 128K RAM card sold at Service Merchandise. This item is not listed in their catalog anymore but I just picked one up for $24.95 today. They show the price as $29.95 but it rang up at the lower amount. I'm not complaining.
Anyway, the number is: HPF1002AXMP
I wouldn't bother with any of the other HP cards they sell as they get pricey real fast after the 128K. ($150.00 for the 512K, if I remember right) BTW Zeos International sells a 1MB card for $199.00.
Hope this helps.
J