I look at cutters as being in one of two "categories." The first category is pretty much typical ball and flat end mills. The second category is everything else including V cutters, round-overs etc.
For the common flat and ball mills, I only purchase carbide as well as I only use "long" cutters. I feel the best and most economical place to get these are through Your Carbide Cutting Tool Source. They stock all the common diameters and carry both the regular and long lengths in flat and ball. They are quick to ship and I have found the products to be very high in quality.
For the second category of cutters I have found various sources online including Amazon, MLCS, Think and Tinker, Rockler, Woodworkers Supply, etc., etc. For those that "poo-poo" MLCS, I have been using their products for over 30 years and have not had a bad experience yet. Just my opinion, FWIW...
For most of my bits I will use Whiteside or Freud. For some cheap 1/8" endmills I just get the Chinese 10-packs off Amazon or from DrillMan on eBay. I have purchased some specialty endmills from Tools Today and often go there for information/education
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