Look at this 48GX + original hp RAM card auction:
http://cgi.es.ebay.com/ws/eBayISAPI.dll?ViewItem&item=3014391941&category=3728
...and no, I dont know the seller.
Raul
Yes, it is a good price, however I noticed that the box isn't original to the calculator; the box is for a 48G, however the auction is for a 48GX.
B.