I make my own.
You need a 6" bench grinder with 13mm and 6mm square profile wheels and ditto half round.
It's very easy once you get the knack and amazingly cheap. Cheaper than router cutters by far.
We can do anything from be done from a *** packet drawing to a CAD drawing if your interested just drop me a message I'm sure we can help you. (Charlie please delete if not allowed)
I’ve used Appleby in the for a number of things. I’ve always when needed been able to speak with someone knowledgeable, honest and does what they promise to do: for me, that’s the best kind supplier and one worth supporting.