actually it is the worlds most expensive spice. here is just one web site i hit at random. http://www.saffron.gr/
http://www.americanspice.com/catalog/item-21597.html this site for prices:
1gm is about $9
1oz is about $100

the reason i knew saffron is the most expensive spice is two reasons, my girlfriend cooks with it all the time. i am also one of the masters of trivia.
john