For some, traditional gardening is too labor intensive and physically demanding. Raised bed gardening, including square foot gardening, is a great solution. There is little hoeing, weeding, tilling, and toiling. However, those with physical limitations still find this to be very difficult.
I have found a few sources of elevated gardening boxes–these are an ideal solution for the elderly, those in wheel chairs, and anyone who finds it difficult to bend while working at the garden.

RTS Garden Table with Fixed Legs
Found at Amazon.com
Cedar Boxes with Legs
From SquareFootGardening.com
Instant Garden
from EasyGardener.com
Happy gardening!