I've no idea what country you're in, so here's some that cover the major countries:
(It's about the same price nomatter which currency you buy it in, I have bolded the UK version as per your comment)
Full disclosure: I know the people that run this website. In fact I've worked with them in the past, and we use their services my workplace.
This one's a little old, but I've used this free app from IBM to great success in generating privacy policies a P3P policies: http://www.alphaworks.ibm.com/tech/p3peditor
Iubenda have a policy generator with a lot of nice modular bits you can include, like which services are used on your site and hence what information is collected. They then provide you with an image link to the generated policy, a bit like Creative Commons licenses are often displayed.
There's also a pretty cheap "pro" option that allows for white-labeling and a few other benefits.