Hi, We don't. Best place is eBay, there are plenty available there. How does klipper perform with leveling. I have wanted to give it a go but been put off by the current lack of functionality.
Currently, Klipper has simple bed tilt calibration which should work pretty well with your linear rail version, but it requires a probe to determine the bed height at several different points to calculate the slope and intercept for the x and y axis.
The developer, Kevin O'Connor is very responsive to requests and willing to co-develop new features. If you have x,y,z coordinate data (vs using a probe to measure it) it shouldn't be too difficult to add the ability to work with it.
I am not going back to Marlin; the print results I have seen with TPU are much better than what I could get with Marlin running on Rumba with bed leveling using 4 stepper motors simultaneously.
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