A defib costs about a grand and if placed outdoors, the cabinet would be about £500. Your local ambulance trust might supply them as a package including training. There are many grants available to reduce the costs e.g. the British Heart Foundation, London Hearts (not only London) and Lottery Awards for All and it's a popular item for a public appeal or crowdfunder. We ran a public appeal for a month and raised £2,400 in a community of 700 residents.