There are lots of Associations someone can join if the want. IAHP members all seem to say it is the best association they have ever belonged to. One of the key reasons is the website listing that most members say get them more jobs for the $ 100.00 investment than they can get spending thousands advertising any other way.
Throw in the discounts available from suppliers. The free subscription to the Associations magazine, Soil Erosion and Hydro Seeding, the helpful forum, the certification program that lets you become a "Certified HydroSeeding Professional, the Regional meetings with expert speaker and all the other benefits and you can't go wrong. For more information check out the Associaton website at www.hydroseeding.org