easyfundraising.org.uk is the UK's biggest ‘good cause’ shopping site, having already generated over £5million pounds in donations through online shopping. They currently have over 2700 retailers, 55,000+ good causes, and over 500,000 registered supporters. The owners of the site have recently taken ownership of Spend and Raise and are in the process of migrating all their causes over to easyfundraising.org.uk
Why not use it for business purchases as well? For example, office equipment, stationary, flights and hotels.