A company named Pace Punches sells tubular punches in a huge variety
of sizes, both English and metric.  They have feed-through punches
(that's probably what you want) as well as other types (ID, OD etc).
The minimum orders are small and prices are low so you can buy all
sorts of stuff you don't need and it will not be that expensive.

  http://www.pacepunches.com/ 

You will need to make something to hold the punches for use on your
piano rolls as they are intended to be used in standard height press
platens.  I bought all the punches in 1/64" increments, plus multiples
of the ones I use the most, for less than $150.  I got a lot of punches
for that amount including big ones for stack valves, etc.

Best regards,
Spencer Chase
Garberville, California
http://www.spencerserolls.com/