I managed to pop into Mitre10 today for some supplies and was stoked to find the Yates Giant Pumpkins. While you don't eat them, they are by far my favorite crop.
We managed to grow some at our last place and even stored them over Autumn and Winter for use at Halloween. It was a real talking point on our street as many people had never seen them before.
Be warned that there are only about 6 seeds in a pack but to be fair who needs lots of giant pumpkin seeds. If you have the space I'd thoroughly recommend growing them for fun. It's cool trying to get the biggest pumpkin!