to order online will probaly cost you a good buck and you will be getting a lot of shrimp. here are some places that sell online and ship live, but i would ask local pet stores if they would special order first, before buying on your own. the last two sell brine shrimp eggs that can be reared into adults for feeders.

http://aquaticfoods.com
www.livebrineshrimp.com
www.thatfishplace.com
http://www.brineshrimpdirect.com/