I'm not sure what type of memory the uA1 takes but this might be right for it.
This is 256Meg PC2700 SODIMM from my brand new Powerbook, but I've upgraded the memory so I don't need this SODIMM... So if any one needs memory that is graurenteed to work in a powerbook... here it is...
I'm not sure how much this stuff is worth a quick look on Ebay suggests £10.