+1 for Le Prevo. Identity Leathercraft also do a load.
I had them make up a load of bespoke ones for my motifs - you pay for a sheet that can contain a number of designs that you then have to cut up yourself. I use them with a press or, if I'm just using it once, with a G clamp.
This is the badger head I use on my leatherwork (on quiver no2)