It is not cost effective or very convenient to order aircraft supplies from a catalog. You have very few choices and very seldom are aircraft supplies put on sale. Nor does not pay to buy an aviation GPS unit or products like Camguard from a local pilot shop as these stores are known to charge top dollar for everything they sell.
Nowadays, savvy pilots are shopping for aviation GPS units and other aircraft supplies over the internet. There are scores of pilot stores online and many have been selling their goods on the web for many years. You can very easily find that container of Camguard oil additive you need online at up to 30% less than what catalogs and local pilot stores charge. So do yourself a favor and find a reputable online store to use which carries Camguard as well as many different aviation GPS units and other supplies you need at low, everyday prices.
The best aviation supply stores have thousands of items in their inventories. The top-rated stores are run by aviation specialists and pilots like yourself who are very knowledgeable about the products they sell. If you should have any questions or need help, you can expect to receive assistance from experienced experts. Once you find a store to use, you will never again want or need to buy aircraft supplies from a catalog or a local store.