Smart Keyboard for Apple iPad Pro 12.9 2nd

I have an Apple iPad Pro 12.9 2nd generation that I purchased several years ago. At the time of purchase I opted to invest in a Smart Keyboard for it also. Back a year or so ago the Smart Keyboard stopped working. I checked with the store where I purchased the keyboard to see if I could get a replacement and was informed that they no longer make this particular keyboard or at least not for 2nd generation. Does anyone know where I could purchase an aftermarket keyboard for an Apple iPad Pro 12.9 2nd generation? I really don't want to buy a used one as I have found out by experience that you quite often are buying someone else's problem.