I like running my own wires when I can find the right colors. I finally did on eBay. Use the standard marine wiring color guide and you're all set and anyone can figure out what you've done.
#14 item number: 190234841505
#16 item number: 200236898925
I don't know where you are buying #10 wire but you can get that from Lowe's or Home Depot, stranded for about $ .50 a foot or less. So both the black and white can be had (20 feet x 2) for about $20.00. You can twist it or you can run it through convoluted tubing that I got from SummitRacing.com. As for connectors, you can find them on eBay as well, but it's just as easy to go to your local big box store and buy them or automotive parts store.