On-and-off, I will monitor the respective websites of BullionStar and GoldSilver Central for any second-hand antique bullions offloaded by other customers. As a pet rock collector, the appearance of multiple Saint-Gaudens Double Eagles at BullionStar's site a couple of months back piqued my interest.       After spending a few weeks contemplating whether to plough my funds in to add the esteemed coin to my personal collection, said coin went out of stock. Oh well, I thought. I have missed the boat. Anyway, the coin is not something that I must have; it's something that is nice to have. So, I wasn't too hard up over it.   A couple of weeks later, I noticed these same coins appearing at GoldSilver Central's website. I did not keep track of the gold price across that period, but what I did noticed was that the Saint-Gaudens Double Eagles were sold at a much lower price ......