Buying eclipse glasses in bulk changes one thing about the decision and it is not the price. When you hand a box of viewers to a hundred people, you have taken on the checking that each of them would otherwise have done, and none of them will inspect the filter before they look at the sun.
Buy from a checked supplier, then check anyway
The American Astronomical Society publishes a list of suppliers whose products it has verified, and a bulk order should start there rather than at a marketplace search. Then inspect the delivery: a printing run can be fine and a shipment damaged, and one creased filter in a box of two hundred goes to whoever happens to pick it up. Open several at random and hold them to a bright indoor lamp.
Branded and custom-printed pairs are the same product with a logo
Custom printing is done on the card frame, not on the filter, so a branded pair is exactly as safe as the filter its maker used and no safer for carrying your organisation's name. Ask who manufactures the filter material rather than who prints the frame, because those are usually different companies and only one of them matters.
Made in a named country is not the same as made by a named maker
American made is a common claim on this product and it is worth exactly what the traceability behind it is worth. What protects a group is a manufacturer who can be identified and held responsible, wherever they are. A pair with no identifiable maker is unverifiable regardless of the flag on the packet.
Questions people ask about eclipse glasses
How many spares should I order for an event?
Enough to replace anything visibly damaged on arrival and anything creased during the day, which in practice means about ten per cent over the headcount. A damaged pair must be discarded rather than passed along.
Do bulk eclipse glasses expire?
Not on a schedule. The old three-year guidance was withdrawn; what matters is physical condition. Store them flat and away from heat, and inspect before each use.
Can we print our logo on them?
Yes, and it changes nothing about the safety, because the printing is on the cardboard frame. Choose the filter first and the printing second.