For a simple serial cable you can get one for around 15 plus shipping.
I got a power/data cable from
www.pfranc.com for $14 at the time. It was about 2 or 3 years ago. They run now around 29.97 and not including shipping.
One thing I do like of the new cable is that it is straight cabling. My power side had a coil wound and was heavier. It is just my preference though.
http://www.pfranc.com/cables/index.shtml
BUT >>>>>
You can find them on ebay at around $15 for the data/power combo cable and 5 shipping:
Here is an example:
http://cgi.ebay.com/ws/eBayISAPI.dll...&category=4668
You got 13 hours at the time of this posting. ;)