I Leica You (a lot) Card, from Green House Paper
Fun fact: The Leica in the photo was actually purchased from KEH!
I Love You More Than My Camera Paper-cut Greeting Card, from Storeyshop
Canon L Series Love You More Than Greeting Card, from Everlee Designs
(seller also has a Nikon version card available)
Film Heart 4x5 Card, from xoazuree
We Just Click Card, from dudeandchick
(yes, we've featured this card before but had to include it in this post also)