A friend of mine has sold his Questar reflector (May have been a catadioptric, not sure). He's selling the EP's that came with it separately, and I'm considering purchasing them, but I was wondering (1) how good of a reputation does questar have, and (based on 1), would the EP's that came with it be worth purchasing. I don't know their focal lengths, so they still may not be useful for me, but I want to do some research and find out if they'd even be worth it. Are there any gotchas or things to watch out for with Questar EP's?

Also, can anyone give me a ballpark figure on a fair price, or somewhere I can lookup used telescope accessories so I can do some research for myself?