Tinyprints has a great deal on some of their most popular personalized greeting cards.  You can create any one of them for only $.99!  So much cheaper than a store bought card and so much more personal.

Friendship Cards
Thank You Cards
Thinking of You Cards

Use code FRIEND99 to get this great price.  This deal expires August 2nd. 

They are also having a Christmas in July sale.  They are offering 20% off any Christmas card order (if you plan that far ahead).  Use code JULYHOL at checkout.  It expires July 28th so you will have create quickly if you want that 20% off :)