HotLine offer customer keyrings, carrier bags, rulers, etc for advertising your business/ charity/ group.
They only sell in bulk but prices are competitive, and if you phone their free phone number 0800 980 70 60 you can get a free sample of any product.
Or if your lazy (or have a premium rate line lol) use http://www.hotlinegroup.co.uk/callback.asp?from=home
and get them to call you back.
NB: Only use the business number for genuine business enquiries. The above number is for home customers only.