>>7305516The cheapest official ones are all the regular releases of DA01 to DA06. These were all made in excess so you may be able to find discounted ones even now. Every release after that was made in limited numbers and are pricey AF on the aftermarket.
One thing to redpill about the KOs is that they are not magic. The tolerances can and often will be wonky so you better know how to tighten and loosen joints. This is especially so with their powersuit mold. All their powersuits share the same base frame, only differing in the faceplate and accessories. KO companies DO NOT maintain the tolerances on their molds and the later the release, the more issues it'll have. I had to go through all the weapon joints in their SAT set.