Do you take your significant other, for better taste or worse, in Doctor Who reruns and marathon Portal sessions? Do you pledge to re-read Harry Potter together and listen to The Hitchhiker's Guide to the Galaxy radio plays on long car trips? Then you might want to send out these beautiful save-the-date cards.
Geekvites makes these cards in a number of fandom flavors. It's the perfect way to break the news to your parents that yes, there will be a TARDIS photo booth at your wedding and it will be awesome. A pack of 50 customized cards will set you back $90, with slightly less per card for larger packs.
Edit: As a bonus for io9 readers, Geekvites is offering 10% off on save-the-date cards through the end of June. Just enter the coupon code "io9" when you order. Thanks, Geekvites!