Amazon. Skyhighcaraudio kit. $45.
Is it CCA or 100% copper? I spent about $20 on 10' of 1/0 100% copper welding cable (all black and used red cable lug covers on the hot sides) ~$10 on tubular cable lugs. ~$10 Marine grade dual walled adhesive shrink and ~$10 split loom. I also dropped ~$40 on a hydraulic crimper which is awesome. Makes the job so easy!
I got this one:
https://goo.gl/VfwQRY
HF has the same thing:
http://www.harborfreight.com/hydraulic-wire-crimping-tool-66150.html
I don't see a fuse in the kit? Are you planning to run one?
I did a big three when I replaced my alternator, and swapped in a smaller pulley. If you've got some left over maybe do the big 4 or upgrade your starter wire. Started up quicker, and really helped with voltage drop on mine. Windows rolled up a bit faster too.
Honestly, I didn't NEED it since I ran a stock stereo and no aftermarket big draw electrical components, but I figured it was time to fix up the grounds since I could see lights dimming at times. It was less expensive than factory replacement cables, and a fun little project.
Also a complete waste of money since the damn thing got totalled out a month or so after that...