You can buy either a portable hard drive, or a portable CD burner, I'd recommend a portable hard drive which interfaces with your memory stick. Here's some links on the options available to you:
http://reviews.cnet.com/4520-6501_7-5144299-1.html http://reviews-zdnet.com.com/4520-65...5145238-1.html
If you don't have time before your trip to buy it online, you can go to an electronics store, such as Best Buy or Circuit City, or CompUSA or a local computer store to get a portable drive.
Have a great trip!