As other have also noticed, some ebayers are selling lego products that are actualy cheaper to buy brand new from lego shop and the high street.
I felt sorry for the guy that outbid me on a lego set and ended up paying more then it was worth, It really is a a case of buyer beware!!.
My advice is do a bit of research before you buy, the lego shop seems to be the bench mark on prices although some retailers do offer items at sale prices from time to time.
So have a good check around before placing your bids..