There's the basic USGI sling from Appleseed.
http://www.appleseedstore.flyingcart...pid=10&cat_id=
You'll have to tap in sling swivels.
Just about everybody makes one and as far as attaching, it will differ depending on which model you have. Some 10/22's even come with swivels. If you have the carbine then let me suggest the stud that clamps into the front barrel band. Most others, you will have to drill the forend and use the machine screw stud. Do not put a wood screw type in the forend but these are okay for the butt end. Lately I have been installing Uncle Mikes fairly exclusive as they seen to have the wider variety. You can also mount a barrel clamp type but feel you won't have to on your 10/22. All of Unclemikes products, come with good instructions on how to install. ....Does anyone make one? And how do I attach it as the 10/22 does not have anyplace I can attach it.