Yes, that is a shame. I am down two chairs, and haven't found anything both durable and not white while thrift shopping.
You can always paint them black!
Actually a good quality can of spray black lacquer would probably cost more than the chairs would.
Rather rarely I would paint some objects in our store. I started when it was my father's. We had a clock behind the desk from one of our manufacturers that he had painted red and antiqued.. From there we went on to do various things mostly for fun, it was not time that was financially rewarding but it gave us a unique look here and there. There was one picture in our store that a customer said "I would buy it if the frame was red". So we did it. No money down, just trusted her. Well she reneged. This may have even been a version of the picture and frame. Please ignore the colors of the picture. That is not how it would have come to our store. This one may have suffered severe sun exposure of excessive tobacco smoke:
That is just for the colors. Grandma Moses painted quite a few pictures using that house.
At any rate the finish on the wood would not take the red paint that I wanted to use as a base. And since I forgot, I would take the picture and glass out of the frame so I was working with just that. Now I had a frame with crapping looking red paint on it. It looked awful. So I took a wire stripper for a drill and ripped off my work, and the finish underneath. Plus some of the wood. I know had a bare frame with grooves in it from the stripper. But I had remember my basics and done everything with the grain. It sill had a look of a natural wood grain to it. Next I sanded it so it was not horrendously rough, painted it, put on an antiquing glaze and then put on a spray lacquer that I knew would craze. A bit of steel wool to polish it and a quick clean and reassemble and it was done.
It was gorgeous, which is why I wondered why the lady did not buy it. Especially since we did not raise the price for all of my work. So we raised the price and put it for sale on the floor. Usually above a sofa that complimented the frame and picture. It did not take long to sell. Every since that we would buy one to replace it and do the same. It was a combination that could not be purchased anywhere else.