If you're interested, here are the sources for the cards.
one // baker's twine (note: this large spool is from Crate & Barrel; for smaller spoons: Shop Sweet Lulu)
two // Swedish Fish
three // Paper Source 5.75x5.75 square envelopes in pool
four // gel pens
five // Paper Source 5.5x5.5 square cards in red
six // Paper Source cover weight paper in white
seven // Paper Source printable label sheets in red
Other items not pictured that I used: scotch tape, double-sided tape, scissors, paper cutter and cellophane to wrap the fish. The return address stamp is a custom design, cut and printed by Paperwink.