I finally remembered to call Mayfair Games about my missing Settlers of Catan resource hexes. I told her which ones I was missing (3 brick, 3 sheep, 3 3-1 ports). The customer service lady said that they came on two sheets together (sheets "b-2 and b-3"), so obviously something hadn't been included in the original set. She is mailing the replacements out today.
http://www.mayfairgames.com