Is it cheaper or order discount wedding invitations or to print your own?
You could have really great invitations by creating your own at a very inexpensive price. Go to CropMom.com at http://www.cropmom.com. to Upload your photos. Make your invitation using them. You can add your own text. There are thousands of graphics to choose from to create your invitation.
For print-quality, you can purchase a JPEG file of your creation (it doesn't cost much - less than $2) and download it to your computer.
From here you can either print your invitations at home. Or have them printed by a photofinisher such as Shutterfly or Snapfish or perhaps Costco. Your total cost for a very creative invitation would be at a substantial savings.