The stamp is a brand new Sparkle Creations Rubber Stamps one called 'Easter Bunny Ruby' and is so new (it's from the February SCRS release) that if you'd like to get your inky fingers on her, you'll need to contact Kitty and ask her to add it to the next order! ;-D
Here's a full list of supplies available from the MMSC store:
SCRS Easter Bunny Ruby rubber stamp (email to order)
Card blanks (I always use this size and then trim them if I want a smaller card)
I hope you have a wonderful day!