Dont know about milling cutters,have not needed to replace any yet,but something else came to mind.
Recently,I went looking for a thread gauge to grind tool bits for Acme threads,no big deal you might think. Wrong ! I was unable to find a supplier anywhere in this part of the world,so I went shopping on the Internet. These gauges seem to be quite common in America and I found one place,I think they are called "Shars",who told me that "Yes sir,you have come to the right place,we can supply your gauge for only $8.99 if you buy online" I thought" Fine,that will do grand,but lets just check about postage,or "shipping" as they like to call it,so I did.
Surprise,surprise, "Yes sir,your gauge is only $8.99 and the shipping cost is $35 extra". I said "No sir,I only want to buy a gauge,not shares in the company" Perhaps they were sending it by Pony Express and the high cost was to feed the horse.
A friend found another supplier on Ebay ,in China,who sells the same thing for $6.50,with little or no shipping costs,although it does take a bit longer to get here,but so what?,how often do you use something like this,so you will have it for years.
So the lesson is,look before you leap,or check before you order,else you might get a surprise.
Does anyone know where I could get a "Keats" angle plate of a size to use on my 6" lathe?