That is a good price.
You will have to see how it plows after you get it cleaned up and after you learn how to plow. The first time you drop your right wheel into the 'dead' furrow so the tractors cants to the right, you will wonder "what have I gotten myself into?
The moldboard has to be rust free and shiny to pull properly and to turn over the dirt properly. A rusty moldboard is a high friction, high draft force, moldboard. You will likely require some Naval Jelly, rust dissolver.
Many apply a coat of grease, preferably water resistant marine grease, on the plow moldboards between uses. This has not worked for me in hot, humid Florida. I spray one thin coat of whatever color Rustoleum spray pain I have on the clean moldboards between uses. One thin coat scrubs off quickly, yet has given me 100% rust protection.
I keep a old-time, 18 ounce cotton tarpaulin over my plow. Do not use a plastic tarp, which will cause water condensation and rust on your plow.
I try to plow in January here. It is beginning to get cold then. We have an occasional freeze. February is our coldest month. I generally Disc Harrow in early March. In April it is time to seed my Spring/Summer food plots.
I also plow and Disc Harrow gardens for old folks in the area, on request.