Your ebait find has been for sale since May and he's had two offers on it. Personally I don't think its a bad price but being me, I'd offer him around $150. maybe $175. if he pays shipping.
The good thing is there are a lot of lenses out there for good prices. Don't fall in love with these things or you're going to pay through the nose.
Have you checked KEH? their not alway the least expensive but the have a warrantee and great customer service. Their ratings are very conservative and many people here will buy BGN rated items and find only minor defects.