I've bought from Cartridge on Sale a few times and have always been happy with the service, quick delivery and product quality. There is so much competition in the cartridges field that it's good to find a company who can beat others on their customer service.

Highly recommended. Happily, they sent me a sticker that I keep in a visible place so that when I need to order more cartridges, I don't have to remember the business name (there are many similar ones).