Your nearest computer shop should have it. Or try your favorite e-shop.
For example: http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&N=100007533&IsNodeId=1&srchInDesc=usb%20to%20sata%2Fide&page=1&bop=And&ActiveSearchResult=True&PageSize=20
I have a Toshiba NB205 that wont turn on any more. Other blogs report this as a common problem. I believe the HD is still good, so where can I get an external case/cable to plug it into another computer using the USB so I can try to recover files? HD info: HDD : 5K500.B-160 Hitachi HTS54501689A300 5400RPM 160 GB SATA 3.0 Gb/s