Anyone do or doing car airfreshener things?

I saw pictures of these little car air fresheners that people had the valets put in peoples cars (saying things like 'drive home safely!' and the bride/groom name and wedding date) and thought it was a cute idea, but I'm having trouble finding a place that will be reasonable -- most places have 200 or 500 piece minimums and are expensive if you order that few.

we also considered ordering coasters that look like air fresheners and hole-punching them (they look like the air fresheners) which are a lot cheaper, but i dont think they would have double sided printing and they wouldnt smell...

any suggestions? if you did this or are doing this can you FM me prices? we'd like to get 100 or 150 max