The Census Bureau provides sample data to help you review population and housing trends. The Time Share Users Group has a web site dedicated to time shares. The American Numismatic Association has information on collections of coin and currency. However, if you want a price on a Double Eagle you will have to visit one of the dealers. The American Gold Coin site can help answer this question and others regarding the value of gold coins.
Prices depend upon condition, so review the definitions of condition carefully.
EagleWing Research provides information on gold funds. Click on N2 in the row for the American Century fund and examine the graphic. Review all the information available at the home page. You will find a variety of price quotes related to different contract maturities. Divide the quotes by 1000 to read the actual price.