Got the cable and some recommended tools on Ebay for $30. Just did this on my old N7 and it works perfect now. Head up tho, the recommended tools didn't come with a small enough head for the two 2.3 mm black Phillips screws. Luckily i did have a super small one. Don't strip those or you SOL. Also the cable doesn't come with the headphone jack cover. it is held on with just tape so take that from the original cable.
Do a ebay search for "Nexus 7 I/O". Should pop up. Look for cheaper ones than the $60 ones.