Amazon's well known as the one-stop online shop for practically anything you might want, but apparently it has, until now, regretfully underserved numismatists -- that's coin collectors to the uninitiated. According to the company, rare and collectible coinage is one of the most popular product categories people search for on its collectibles and fine art portal. As such, Amazon's thought it necessary to open a dedicated page (in the US, at least) showcasing such items from "highly regarded dealers." The Collectible Coins store is now live for your perusal, through which you can even buy a 1907 Saint Gaudens Ultra High Relief Pattern $20 coin -- provided you have $3.75 million to hand. Not the best exchange rate, but the shipping's free, at least.