Hah! I just realized that silverprice.org's silver chart has a legend at the bottom showing which markets trade during which hours!
kitco has the same graph with the various markets. if you scroll down from the main chart at the top, the next graph is the same one.
Man I do not get there Buy prices at all. Kitco that is only 75 bucks for Australian silver, and a bunch of Canadian, But showing 88.00 for maples?