I believe they sell some funny ones at Pulp on 14th Street, too if you didn't want to deal with online (need it sooner, etc).

Otherwise, Etsy is the best

Thanks for the suggestion, found some awesome ones to choose from on Etsy.

Ditto the Etsy suggestion! There are some really talented designers on there.

Try etsy!

My niece and her DH are expecting their first. Any ideas for a website that sells cards that aren't too over-the-top saccharine sweet/flowery/rainbowy? Thanks!