Brownells had their BRN-22 takedown actions on sale yesterday for $99...if I was going to build a 10/22, that's what I would start with, if you can't find a Ruger donor action.
Here are some related products that LRH members are talking about.
Clicking on a product will take you to LRH’s partner,
Primary,
where you can find links to LRH discussions about these products.