There are a few ways to go about trigger jobs:
1) Buying an aftermarket trigger group,
2) Having yours gunsmithed
3) Installing aftermarket parts yourself.
Aftermarket trigger groups cost a lot of money, and often don't provide any better results than having a stock trigger group modified. Jewell, Jard (no longer in production), Volquartsen, and KID all offer TG's for 10/22's - the prices range from about $200 to $300. In my opinion, only the KID is worth the money, but the Jard got excellent raves when it was available.
For about $100, a competent gunsmith can get the stock group to 1.5# reliably. Sometimes they use aftermarket parts, but often modify exising parts.
Aftermarket parts rarely ever get the trigger below 2-3# unless some additional work was involved or the tolerances of that particular trigger group just happened to be "just right" and it "just happened". Most hammers cost about $30, most sears about $30 also. You can get away with just a hammer if all you want is a lighter trigger, but adding an adjustable sear makes it all that much nicer.
And again, in my opinion, if you're going to spend $60, get the Rimfire Technologies by Skeeter trigger group kits - it includes an adjustable hammer (mine both break under 2#), an adjustable sear, and oversize pins for the hammer and sear. Of all the trigger parts kits, this one is the best designed so far; it is the same as having your group custom gunsmithed, but without the cost and waiting.