Cost is nothing, for a single turntable you can easily find great mm/mc phono stage for very modest cost, it will be a box with one input and mm/mc switch. A phono stage like this will cost no more than $700-1000 (like JLTi with RCA plug load resistors on the back), used always cheaper.
If you want a fancy box with more than one input and many additional features you can look for Gold Note PH-10 (still reasonably priced used).
So many phono stages for astonishing high prices available for those who can pay more, because some people are crazy about numbers, if they have $5k cartridge then for some reason they want a phono stage for higher price, same about turntables. This logic is nonsense, but this principle promoted by retailers/dealers who are happy to push more expensive gear, but they are living in the world of latest new gear only, and their buyers are slaves of numbers.