Hi guys, been a while since I've been here, glad to see the Creek still thriving!

Question, I'm looking for a way to cut about 300' of 1/2" dado in a floor, and I'd like to use a saw to do it. I remember seeing an old Skil groover saw once, but it is probably an extinct creature. Does anyone make a dado worm drive or similar now? I'm expecting nails, so ideally a stack of regular 8 1/4" blades so I can toss damaged ones.