I got my punch set from the dallor store in the scrapebooking section , has 8 different sizes from small to large and works just fine for me . For really , really small iteams I made my own from brass tubing . Sometimes you don't have to spend a lot to get the best results .
you got me to thinking when you mentioned brass tubing. i dug thru my electronics junk and found a box of what are called pogo pins. they are brass pins that are spring loaded and have a contact on a plunger mechanism. some can be soldered to directly with a wire and some slide into a brass socket that is wired. i had about a dozen sizes and several styles. i tried them out and they work quite well for punches. a plus is that the tail to solder wire onto is shaped like the tool made from brass tubing that was featured in an article here on how to make scratch scale weld beads. so, it was a double score! (although i think that the weld beads on a decal sheet would be the way to go... )
thanks for the spark that ignited a brain storm!