These are available through Seeds of Change. Heirloom peppers are another interesting addition to a kitchen garden. Monticello offers one of the most unique old peppers, McMahon's Texas Bird Pepper. Native to Texas, it grows 1 to 2 feet tall and is covered with tiny, berry-like red fruit in late summer and fall. It's so showy it could find a happy home in a flower garden as well as a kitchen garden.
Heirloom beans are also unique in color and taste.
Monticello sells a Wild Goose Bean which is a gorgeous maroon, tan and white striped shelling bean that is wonderful when used to make baked beans. Grow 10-15 plants per person, or two hills per person. Any kitchen garden needs good soil preparation. Most veggies like a pH around 6.5, so getting a soil test is always a good idea. Double digging always helps to loose up the soil.