I searched before asking and didn’t find anything;
Putting woodworking router bits aside, what’s everybody’s favorite source for cutters? Amazon has… some… Carbide3D of course. Any big online suppliers of endmills?
ToolsToday is another one
Besides those sources, PreciseBits and Drillman1 (Ebay) are favorites of many folks here. I believe the wiki has a ton of sources listed. I’ve also bought some from Mcmaster-Carr when I was buying other supplies from them (the only way the shipping cost is justified then).
There’s a section on the wiki for this: https://www.shapeoko.com/wiki/index.php/Endmills#Specific_Bit_and_Brand_Recommendations
It includes mine, the Garr long reach endmills, though the coated Carbide 3D endmills are quickly becoming my new favourite.
Had good experiences with Kodiak products.
I have gotten to where I only use Whiteside bits. They are relatively cheap and high quality. The bits I bought from Carbide 3D are also very good and never had any problems with them.
Here’s another reference that is rather new: Power Jack Motion: Metal Machining Services
Based on their site, they don’t have endmills included on the products they offer, but I think they can make one for you — I’ve read somewhere on their site that they offer customized OEM products.