Originally posted by realitarian Pentax 18-55mm WR, Pentax 50-200mm WR, Tamron 70-300mm, B+W UV filter
Well, $180 is a little high for these two DA lenses (dunno about Tamron), 40 is much more realistic. You might get more if you are patient.
Now, about the two different quotes.. yes, it does sound kind of silly, like getting people to send them lenses with a good offer, and then offering much less once the lenses are there, because most users won't demand the lenses back and compensation for the shipping. I would be angry as well. But you still won't get 180 for the DA L 18-55mm.
It could just be an honest mistake, that the person who gave the original quote looked up some prices of the items sold separately, as new, or the latest WR version and gave an offer that it a little too high.
Btw, this is why so many people just keep the kit lenses. You won't get much for them, but they give you a comfortable zoom range and WR. Other WR lenses cost much more.