well i have the xport that was £30, still a bit steep for one update i guess, alot of people use the xploder cheat saves. ignore the cheat saves bit, it has a handy usb transfer utility, and thats only £20 in argos, will easily get it cheaper online though. Note you will need a memory unit though, will not work with a hard drive. All in all it seems there is no cheap cheap way of doing it, the original link i have sent u has many questions answered regarding different ways of transferring the files, well worth a read throiugh if you have the time.
Hope that helps