We are happy to help with that. Finding materials can be challenging even though there are a lot of places to get them. So a while back some of us from the hydroseeding association decided to come up with a web site to make it easier. Here is a link to the Texas page of the site I built for the International Association of HydroSeeding Professionals.
https://hydroseedingsupplyfinder.com/hydroseeding-supplies-texas/There is a pretty good list of places that sell materials. A couple of others are Ewing Irrigation Stores and Site One Services stores also generally carry hydroseeding supplies.
Hydroseeding can be a really good side business. The machines are pretty easy to run and the learning curve isn't that bad. For just doing your own project I would not worry about this but the Hydroseeding Association does have a lot of online seminars that can be helpful. If you decide you want to do it as a side gig some of those seminars might be helpful. For anyone who might read this and want more information here is a link to the list of seminars that are held in the late fall and winter and are available as a recording after the live session is completed.
https://hydroseeding.org/online-seminars/If you have any other questions let us know. We are here to help.