Truffles, Oysters, Caviar

http://en.wikipedia.org/wiki/Truffle
http://ca.askmen.com/fine_living/wine_dine_archive/59_truffles-why-is-it-so-expensive.html


Oysters
http://en.wikipedia.org/wiki/Oyster

http://www.calgaryherald.com/technology/Puerto+Rico+uses+thousands+oysters+help+purify+lagoon/8560149/story.html
http://www.videojug.com/film/how-to-eat-oysters


Caviar
http://en.wikipedia.org/wiki/Caviar
http://global-chica.hubpages.com/hub/All-About-Caviar