What you have there is a John Deere model 810 plow. That'll have "HSS" bottoms. Looks like you need shares, shins, moldboards, and possibly landslides. You should be able to order parts from several sources, including Valu-Bilt. You can find owners manuals on EBAY. Depending on local demand, that plow will sell anywhere fron $200 to $600. Around here (Kentucky) that's about a $300 plow. It's CAT II 3-point hitch. The CAT I version (smaller/lighter) is the 416A.
"Decent" plow....Not great. Tends to plug in heavy crop residue. Deere plows tend to pull really hard when compared to many other brands. (steep angle of shares, abrupt moldboard contour)