This is just in reply to raw materials being available to all teams.
A company known as Aerosleeves does stock different sleeves of composites and also does sell epoxy and other materials to make your own composite pieces.
Carbon Fiber Sleeves
Fiberglass Sleeves
Epoxy Filler
Another place to get
Laminating Epoxy
I'm not sure about whether or not the cost would fit a team's budget, but that still depends on their design, but it is available in raw form to teams.