On E-bay the best "buy it now" are gone in the first few hours. If you see a "buy it now" that been on for a few days, its not that great of a buy.
Now sometimes a seller will place a B.I.N. after a few days if theres no bids. You need to look all the time and be careful you don't jump in too soon or wait too long.
I once watched these adjustable rockers for a whole week, landed up getting them but for the same price I could have got them if I would have went with the B.I.N. price.:bootysha: