Here are a couple of "micro-flat" cables that fit the bill.
The first is an IXOS cable; the second is an Acoustic Research cable that you can buy at Best Buy (listed as sixth and eighth entries in Best Buy link).

http://accessories4less.com/aless4/Corporate/itemdesc.asp?CartId=10728853XH-ACCWARE-ZLP18&ic=IXOS%2D607&cc=&tpc=
http://www.araccessories.com/performance/speaker/ap1850mf.asp
http://www.bestbuy.com/Accessories/productListing.asp?m=1&cat=783&scat=805&sdesc=Speaker+Cables