You can get 20 5×7 Stationary Cards from Snapfish  for $1.50.  Just use coupon code HPHOLIDAY11 at checkout to save $17 off the regular photo price.  You will need to pay shipping of $5.99 and tax.

A couple of tips to get this code to work:

• Order only the 5×7 size cards
• Print your cards on cardstock, not photo paper