Halcyon Plants have Phormium or New Zealand Flax plants for Sale Online which come in a variety of size and colours all representing excellent value.
Phormiums can be expensive in garden centres but as we grow these from little plants ourselves we can pass on the saving.
Phormiums will grow quickly. They can be kept in tubs for a while but they are best planted out as an eye-catcher or as part of a border.
Study the types as some do get bigger than others.