You may wish to view the Migrow Array.
Or this one at Canadian $1.30/watt with the LM301H series diodes. The SP3000 is CAD $1.85/watt. Not going to dive into the debate over how much better the H series performs over the B. But the H series does have a conformal coating to it to protect from overspray and humidity and even if it's a nominal difference in performance you are getting the better diode for the price. Not sure why they call it a DIY kit. They are sort of shooting themselves in the foot. You screw in a pcb and driver to a heatsink and plug in the wires. When you buy a bookshelf from ikea they sure don't call it a DIY.
Complete Kit 320 Watt FB288 X3 LM301H 3500k + 660nm + UV +IR LED Light
www.growlights.ca
On another note if you shop around Alibaba you will find even better deals on samsung boards and the same meanwell drivers. As for quality, They are all copies of the exact same thing here. Samsung diodes, Meanwell drivers and a heatsink. The likely all get the pcb's stuffed with the leds at the same board builder lol. There really isn't much to screw up on these boards. Running a SMT line to drop these diodes on a board is pretty simple.