Sorry for the delay...
Okay, here's what was in our archive.
From the Thompson & Morgan catalog, you can order giant varieties of tomato, cucumber, marrow, squash, carrots, parsnip, cabbage and pumpkin. Also, the Football Onion which weighs in at 5 lbs.
Gurney & Mellinger's carries the giant bell pepper
called The Big Bertha as well as the Bushel Gourd. The Bushel Gourd grows to 100 lbs but gets lighter as it dries down to 1 lb. It can be cut open and used for a planter or a toy box, etc.
The largest varieties of watermelon...
The Black Diamon from Jung can grow to 50 lbs.
Cobb Gem from Gurney can get to 130 lbs.
Caroline Cross #183 from Burpee can get to 200 lbs.
I would suggest you look for these seed