I purchased the pink tin mailbox, heart and love stamps, and the princess pens at Target for $1/ea.
I used the Plantin Schoolbook cartridge for all the hearts...cut at 1 1/2" and 2". I also used K&Co Valentine stack for my paper and the Martha Stewart Heart lace punch. All the notecards that I made are 3x3, and all layers are cut 1/4" shorter than the previous. I used the bakers twine that I purchased from thetwinery.com and the colors I used were pink sorbet and marschino.