If all goes well, I’ll be getting an order from the company that services our home backup generator to cut / print about 200 key chains (out of basswood) with their phone number and logo on them, to give out to people who either have them service their generators, or who sell them new ones. (They typically have a key for access.)
You might want to speak to local businesses that use keys (e.g. - Car Dealerships, Locksmitsh, etc.) to see if they might be interested in placing an order with you, or even to offer up 50 or 100 key tags as a promo gift for a raffle (for businesses). Using a small key tag format, (slightly larger than a lot of the barcode keytags some retailers used to hand out), you can get about 56 to a sheet of proofgrade. Material costs (for basswood) is $12, plus the cost of key rings from amazon (far less than 20 cents each.) At $4-$5 per tag retail, you would probably get a number of people bidding / buying fundraising raffle tickets, and you would come out far ahead.
I’ve also found that wood (vs. metal blanks you buy elsewhere) tend to be more “interesting” and eye catching, so you will probably do well with them (they look more original and custom).
You could also do Business Cards in plywood as a neat promo item too.
Hope that helps.