Hey sorry, I'm still trying to figure out this listia site. I think that they are made out of clay. The bottom has a sticker that says "Made in China for Accoutrements Box 30811 Seattle, WA 98103"
I'm sorry I'm not really sure. I can try to do a flat rate. If you want to know you can try using a UPS calculator for an estimate. I just tried doing it, but it required knowing the delivery city and postal code. If you check, use Long Beach, CA and 90802 as the sending city.