wher can i find them? new , used? whatever...

i doubt you will find any new rwd KA's since they dont make them anymore. you can always check ebay for them. the classifieds over at 240sx.org has them all the time. Or just ask around town if anybody is doing the sr swap and selling their KA. that's how I got mine

junkyards. wrecked 240's will probably go in all the time and have the engines ripped out and sold (if they're slavagable). i'm in need of a KA myself. the 240 hatch i am about to purchase has a hole in the block, so i need to shove a replacement KA in there so the car is at least driveable until i can afford the SR swap.

www.zilvia.net

people in the forum on that site is constantly doing motor swaps from KA24de to SR20det they don't need their old motors, I seen people trying to sell their KA24de with 50k miles on it for low as $500 at times.