Saving £4 and landfill

At the start of the year I worked out that I'd have to spend roughly an extra £100 to have green electricity - and I still maintain that it's a price worth paying. But I think it would be more convincing if I could determine other ways of saving money while being ecofriendly as well. And this morning, I found one. Rather than bin the printer cartridge and buy a new one (from Epson at a cost of £10), I took it along to my local Cartridge World (only a few minutes walk away) and, after a couple of minutes wait and friendly service, I had a refilled cartridge and had only paid £6. That's four pounds towards my target!
The Headington Cartridge World can be contact on 01865-764454, and their homepage (http://www.cartridgeworld.co.uk) has a store locator, so anyone can find their local branch.