Buxus hedges cuttings
Save some money grow your own buxus or box plants. Although the single plants are not very expensive indididually when you are planting a whole scheme such as a knot garden. The cost quickly adds up.
Using a low polytunnel to create a suitable micro climate and some semi ripe cuttings can save you loads of money.
The cutting take about 3 months to root and are ready to use in a year.