Whatever garden tool you'd like to buy, look out for ergonomically designed tools. That is, tools that are specially designed so as to lessen as much as possible the discomfort you may feel while gardening.
RAISED BED MODULAR SYSTEM from organic catalogue. This can come out of sister's garage and be used for square foot gardening. Yay! (Mel Bartholemew - square foot gardening - make/get raised box, add compost, divide into square foot squares, different veg in each square, use individual seeds or baby plants from b&q type thing depending on time/cost - get lots of crops in small space, cheap, easy to look after, takes very little time to keep going. Awesome idea.