Warning: math ahead.
I really want to do STD magnet postcards. I imagine a postcard that's a magnet - STD info on the front, and a mailing label stuck right to the magnet on the back. And according to the USPS hot line (yes, I called), they do still only require 27 cent postage. Rock! They'll be amazing!
So, I've been checking out the usual online culprits for cheap printing, and it looks like vistaprint comes through with the cheapest on this one - for 100 (I have no idea how many I'll need, but this seemed like a fair estimate for price comparison's sake), it's only $49.99 for regular postcard sized magnets (that's .50 each, for those of you who are as math challenged as I am - I double checked on the calculator). (Plus $4.95 to upload the image.)
However, if I do a STD magnet that's business card sized, and rubber cement it to a postcard, that may end up cheaper (although that makes me wonder even more about the postage changing - USPS is sneaky!). I can get the magnet from vistaprint for 17 cent/each (assuming 100 again), and the postcards themselves (or really, regular 3.5x5 prints) from adoramapix for 15 cent/each (or $.19 for matte instead of glossy, which may be worth the upgrade) - that brings the new (kinder, gentler) total to $.32-.36 per postcard (+rubber cement and mailing labels, and time to assemble).
Here's the easy summary:
big magnets: $.50/each
little magnets attached to postcard-sized prints: $.32-.36/each
So what to do?! Still assuming 100 STDs needed, that's a difference of only about $14-$18. So really, not enough of a price difference to really lose sleep over. And the bigger ones would be easier and look more like they were intended to be postcards (because they were)... and be less likely to fall apart in the mail. But would people prefer the smaller magnet?