Seahorse.com

This site is dedicated to seahorses, is part of Ocean Rider, a 3 acre farm in Hawaii. This seems to be the best place to purchase live seahorses. They have a nice selection and they are all farm bred and raised. The only down side is that the price is some what high but the seahorses come with a warranty. They have some other fish and inverts for sale such as sea hares, hermits and black brittle starfish. They are the only resource I have found for live Red Volcanic Shrimp (Halocaridina rubra). They ship FedEx overnight only which although a bit pricey ensures a safe delivery. There is also a lot of information available from basic husbandry, feeding, photo galleries to care sheets of all the species they sell. If your questions and doubts are not answered there you can join the forum and post your questions... They have a testimonials section that goes back to 2002 with excellent reviews.

http://seahorse.com/