Recent experience... I recently bought a male H. reidi from seahorsesource. I do know one of the owners, who started out as a hobbiest before initiating the business. However, this was my first purchase. The seahorse came packed great, price and shipping was reasonable, service great, animal thriving.
I prefer to buy directly from a breeder - either from a business like seahorsesource or from a hobbiest with a good reputation.