2 Gig USB2 Flash Drive - about $100 ($50/gig)
1 Gig DDR PC2700 for the laptop - $140
1 Gig (2 @512mb) PC800-40 RDRAM for the Alienware - $325
The smaller the memory module, the more it costs per gigabyte.
Anyway, I should be set for a while - PSP = 4 gig; Laptop = 1.2 gig; Alienware PC 1.5 gig; Flash Drive = 2 gig.