Here's a couple of things I've bought / found for mine that work well.
Allen 10/22 Case - Cheap and Fits Well, Cool 10/22 Logo
Amazon.com: Allen Company Ruger 10/22 Scoped Rifle Case (40-Inch): Sports & Outdoors
Hogue Overmold Stock for .920" Barrels (Thick Barrels) - Cheap, Available, and Works (Great Hunting Stock)
Amazon.com: Hogue Rubber Over Molded Stock for Ruger, 10-22 Olive Drab: Sports & Outdoors
Green Mountain 0.920" Heavy Barrel - Stainless, Great Accuracy, and Affordable
Ruger 10 22 Green Mountain Bull Barrel 20" Match Stainless Steel 22LR | eBay
Kidd Bolt Buffers - Takes Out the "CLACK" Noise, Easier on the Action
Amazon.com: 10/22 Kidd Bolt Buffer (2): Sports & Outdoors
Allen 10/22 Case - Cheap and Fits Well, Cool 10/22 Logo
Amazon.com: Allen Company Ruger 10/22 Scoped Rifle Case (40-Inch): Sports & Outdoors
Hogue Overmold Stock for .920" Barrels (Thick Barrels) - Cheap, Available, and Works (Great Hunting Stock)
Amazon.com: Hogue Rubber Over Molded Stock for Ruger, 10-22 Olive Drab: Sports & Outdoors
Green Mountain 0.920" Heavy Barrel - Stainless, Great Accuracy, and Affordable
Ruger 10 22 Green Mountain Bull Barrel 20" Match Stainless Steel 22LR | eBay
Kidd Bolt Buffers - Takes Out the "CLACK" Noise, Easier on the Action
Amazon.com: 10/22 Kidd Bolt Buffer (2): Sports & Outdoors