Button/tag update:
Found some 'do-it-yourself' round buttons at a local craft supply store for about $1.50 each. These do not require any special additional tool or materials to assemble. Very similar to photo keychains and coffee mugs. Pop it apart, insert your graphic, and snap it closed.
The 'badge' idea has merit to. I have access to "borrow" this style of pin-on badge holder:
I could print the inserts myself, and overall cost would be very minimal. I would need to get all of the badge holders back, or else I will have to purchase some to replace the ones not returned. Also, I'd need to make arrangements for someone else to get ahold of these and distribute them, as I will not be available to the group until after the hearing.