I just bought the 13 qt stainless steel bucket from Jeffers - they are on sale for $15.95! That's the cheapest I've seen...if anyone's interested, here's a link:
http://www.jeffersequine.com/ssc/product.asp?CID=1&mscssid=GER68V6HQF4C8JD19C9H5TWD13E6B579
http://www.jeffersequine.com/ssc/product.asp?CID=1&mscssid=GER68V6HQF4C8JD19C9H5TWD13E6B579