These greeting cards are available from Carol Lee Designs on Etsy. The line is called Hate Mail. Gee, I wonder why? Go and check out the rest of her available greetings. My personal favorite is "Darwin almost got you that time. Get Well Soon."
All of her cards are made on recycled paper and have the Forest Stewardship Council's stamp of approval. Eco-friendly and mildly offensive. But extremely hilarious.