This article is from the Model Rockets FAQ, by Wolfram von Kiparski with numerous contributions by others.
Here is a list of rocketry manufacturers and suppliers. The list is divided
into a number of categories. Each address appears only once, but may in
fact qualify to fit into more than one category. The rocketry industry is
rather dynamic, so if this list is six months old, it may be out of date.
The editor(s) of this FAQ can not verify if the companies are, or are not in
business. Reasonable attempts have been made at completeness, though it
is reasonable that this list may not be complete. If you notice any
errors or omissions, kindly email Wolf at email@example.com, and the
corrections will be applied ASAP.