OK, so they are essentially puddle light kits with a DRL module controller. Interesting. I actually like the screw-in style of the iJDM kit better than the clip-in of the eBay kit.
I did a DRL conversion to the front markers which you can see
HERE. It is not really relevant since you are installing them as puddle lights.
$250 @ 80-100/hr shop rate (my area) = 2.5-3 hours, which is not as excessive as you might think. They need to remove the rockers, measure and drill holes in them, run the wires, install the lights, either install a switch or tap into a signal wire, and then button it all up. And they have the tools and space required. Also, the price of the kit does not dictate the time needed and difficulty of the install. That said I persoanlly would not pay anything for the install and do it at home. But I have the tools, space, and weather needed so its not a fair comparison.
Similar install
HERE.