http://cgi.ebay.com/ws/eBayISAPI.dll...525052192&rd=1 There's one 50lbs of unflavored for $130, unknown shipping, but assume a lot..
http://cgi.ebay.com/ws/eBayISAPI.dll...523085793&rd=1
$119 shipped, flavored 33lbs.
The rule is, you get what you pay for, unless you know someone or buy it from ebay...