Need lens pricing advice

[Kajuah]

I'm trying to buy a pentax spotmatic II with a vivitar 28 mm f/2.5 wide angle lens but am having an EXTREMELY difficult time looking up the current pricing of the vivitar and the SP II. Can someone help me out and tell me what the vivitar 28 mm f/2.5 and the pentax spotmatic II are worth now?

I have a spotmatic I, though the person i am talking with is selling the kit along with a prime telephoto (will update on what that is soon as I talk to him next) but for now those two would be great if someone could tell me how much they are

I seem to be getting a lot of links of the nikon version for 50 $ but I am also getting links for the same lens for canon at 200 $?! As you can see...it's a difficult scenario deciding what to come up with as a price.

I also found out there is a 70-260mm included in the deal, would also like a price on that too please