Be sure to include a return policy of some sort so if there is anything is seriously wrong with the klit, you have that option.
But regardless of the price, figure in having the light seals done and a general CLA.
Before using the camera, read the user manual first! This is a tricky camera for beginers n missuse can cause serious damge. Remeber to cock the lens and the body before mounting a lens or it will lock the camera up. A manual is available here....
Be sure to make a donation to the guy?
If the seals are gummy you will have to replace them (maybe DIY?) Check the bellows carefully for light leaks using a bright light inside the camera in a dark room, dry fire the lenses while looking through them to be sure they are working properly, advance a test roll of film through the back.