Wilkos do tomato, strawberry and potato bags that work well for me. I've tomatoes, peppers and chillis, sweetcorn, beans, cucumbers, squash dahlias, lilies and sunflowers in them and never had them topple over. They're not the most attractive and there's *some* danger of them drying out (but if you fill them properly with soil there's usually enough in there to keep the moisture in), but they do the job and they're dirt cheap.
raised beds will look better and be more of a project though, but might be an idea for starting things off before the beds are finished
Suzi (20-06-16)