For sale is a slightly used B&W King 4x5 developing tank. These are designed and made in China, and sell on eBay new for $165 for a single tank and reel. I have two tanks and a single reel. The reel can accommodate 10 sheets in a single batch. This tank is similar but not identical to the no-longer-produced 4x5 Nikor tank. This can be agitated by the usual inversion method, or by twisting the cap - the reel has small wheels on the bottom that help with this method. I'm selling as a single lot. I've decided on a different developing method so am willing to let this go. Asking $100 + shipping / insurance.
Good luck, @campy51 Be sure to report back on how well it works for you. I hadn't been aware of the rotary agitation option for the B&W King tank, though I'm also not sure why you'd use it if you have a tank that can be inverted.