44x2 driver 88.00
8x18 Heatsink 144.00
8x18 Cobs&holders 144.00
Wire 3.00
Thermal Interface 8.00
Plug 7.00
1/8 Angled Aluminum 40.00
Total $434.00
Now that did not include shipping but I had a discount code for cobkits which pretty much offset the shipping. You can also do better on the plug and the angled aluminum I just buy from a local hardware store that is a little bit more expensive. Try to shop local when I can. This is total is about 20.00 more than I paid for my Mars Hydro 2 1200 which is supposed to pull 550 watts but does about 475 if I remember correctly.
I was originally going to run 12 cobs on the two drivers to increase the efficiency, but I have my temperature dialed in with this set and it is working great. I am going to use the other cobs and heat sinks I ordered to make a smaller light for a small tent and flower some photos in there.