I can only link you to the UK ebay item I bought (several of). I also bought the 3.2mm next size down thinking it'd be perfect but it's too small once there's a wire or two inside the sleeve.
http://cgi.ebay.co.uk/ws/eBayISAPI.d...=STRK:MEWNX:IT
On another note - I got the second main power cable finished tonight but I'm having a real hard time getting the wires to stay together so the orange black stripe shows nicely. Any suggestions? Cable ties aren't working - not only do they break up the lines, they tend to bunch the cables together, not keep them in a flat 4 - I also tried some hot glue on the side you can't see and that kinda sorta works but really isn't ideal... Anyone got any ideas on how to make the 4 individual cables look like a ribbon cable (for lack of a better way to describe it).
Yeah I know I'm putting a dent in my airflow, but it's going to block, at most, 25% of the front 2x120mm fan intake so I think I can get away with it...
EDIT: Duh!!! Sticky tape on the back - how obvious???? lol