I Need Your Help!

Self-inking stampers are the most convenient and not that much more expensive, especially if you have to buy an ink pad.

While I've never done this for making commemorative cancels, I've gotten these in previous decades for stamping books/paperwork... Nowadays you can simply submit a graphics file and they can make a stamp out of it.

Not sure of current prices, but the last one I got ~15 years ago was <$15 for a self-inking stamper. I'm still using my first one from over 20 years ago.

You can get them done at the office supply chainstores (OfficeMax/Depot, Staples...). Slightly cheaper online, but on these things I prefer to be able to test out the cancel device immediately to spot inking problems.

The only drawback of self-inking stampers is that the ink color is fixed. If you want to be able to switch colors, you need to use a normal stamper with different color ink pads and some alcohol (for cleaning the stamp rubber, not for drinking 4030434416 ). There are self-inking stampers for which you can switch ink colors, but those tend to be pricey.

Hope that helps. Sorry I can't give you a specific vendor. Hopefully someone who specifically has some cancel device experience will chime in...