Or you can get yourself an additional hard drive.
www.pricewatch.com has hard drives from 2.1 gig to 80 gigs listed, and the prices are much (I repeat, much) cheaper than any retail stores out there. The 2.1 are 41 dollars, and the best value I've found on that site are the 6.4 gigs from 52 to 65 dollar range (not including shipping and handling).
Hope this helps somewhat.