Simple no brainer offer instore price is £54.95, go to http://www.staples.co.uk/samsung-cartridges/samsung-laser-toners/mlt-d1082s-toner-cartridge
Print the page take it your local staples and tell them to price match the item, they will do this and give you a 30% discount on the second item, you will also get a 10% additional discount because that is the current promotion this month. Now due to a glitch on the coupons part of the system they use, the price goes from £109.90 down to £59 or thereabouts.
RRP on this toner is £60 so straight away you have one for free basically.
Awesome toner for the ML-1640 and ML-2240 printers. I will attach a pdf so you can print out my receipt and show them. I have purchased 8, which should last me under a year. This truly is an outstanding offer if you run a business and rely on these printers like me, or better yet these sell well on ebay for £50 so could be a good money making opportunity for some.