Banksia Pods are found in the state of Western Australia, roughly along a line extending from Perth to Denmark, and are generally harvested after April. I currently have a Waiting List (see below) for Whopper Pods.
PLEASE NOTE . . . Though I occasionally get Whopper Pods up to 14-15" in length, they are EXTREMELY RARE. And the larger ones may not be better than the smaller ones in terms of seed hole uniformity, density or diameter/shape. Any pod over 9-1/2" long or > 3-1/2" diameter is Whopper grade. Average size is generally 10-11" with a mixture of some 12" or a bit larger pods.