You are correct on the factory take offs, exactly what I am looking for. And yes trying to keep the price down for the most part. If I wanted to spend out a ton of money I would just buy one complete with upgrades.You can find alot of parts for a 10/22 on ebay or gun broker. Best bet to keep you overhead down. Buy factory take offs if someone is willing to sale. (I know thats what ur asking for) . As for triggers. Learn to do trigger job urself (extremely easy!! ) Youtube. The only part thats hard to find obviously is the receiver itself. But here a link to the cheapest one I found . Good luck . If I can help with advice or tips. Pm me. I've built 100's of them over the past 20+ years.
Ruger 10/22 receiver , NEW factory stripped receiver 22LR with scope mount - Semi Auto Rifles at GunBroker.com : 974360713
Or this one at Brownells.