Tanner moulds from the UK have or at least used to have VERY fast delivery.
Jeff passed, but his son still runs the business. They are also less expensive than most any other 'custom' mould.
I have 5 of them, in .595", .677", .710", .724" and .740".

Excellent moulds of brass that fit standard handles.
I use plyer's type wire strippers to snip off the sprues, with a slight twist and leaves a perfectly round ball, without a sprue, so "orientation" is not critical.

For me, in Canada, receiving a mould from them, is faster than getting one from the States. 7-12 days, usually. It takes 3 to 4 weeks for a mould from the States.

https://www.ballmoulds.com/