I ordered one off Amazon for <$10 back in January of 2021 for my 10/22 takedown. Has worked just fine for the rifle to mount whatever optic I wanted.
BTW, if you still have the Ruger plastic on the thing, take a look at the Magpul stock. I swapped mine out and the Magpul is a LOT better. The fact that the barrel piece nests into the stock means it's easier to store and take places. No more needing to deal with the bag Ruger sells the rifle with. Since adding any optic to the 10/22 takedown turns using the bag more of a hassle.