The trigger sells for 149.50. Coincidentally, that is how much my entire 10/22 cost. Actually, I bought it used for $150 even, complete with a cheap 4x scope on top. I took the scope off and threw it away, thereby reducing the value of the rifle to exactly $149.50.
I dropped the trigger in myself -- more on this in a moment -- and it is wonderful, breaking at a clean 2 3/ 4 pounds with that "snapping a glass rod" feeling that good triggers possess. The factory trigger, by comparison, tripped at a squishy 6 pounds. Switching triggers made my old .22 feel like a whole new rifle.