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I bought mine a loooooong time ago, but I'm pretty sure they would've come from RS
https://tinyurl.com/y2mrjpvb
Given what you've said, this might not be the tip for you, but if you want them to punch to a consistent depth, use an automatic centre punch rather than a hammer.
I've got a couple of sets of letter and number stamps. All I'll say is that it is incredibly difficult to get the letters to line up in a straight line - even when you line them up against a solid, square, clamped object.