This dropped through my postbox this morning - Eucryl Tooth Powder, I'm very excited!
To be honest, my teeth have never really been that bad - I don't smoke and I don't drink coffee or red wine so they're not stained but I've always wanted whiter teeth!
For 99p from Ebay I have received 50g of 'powerful stain removal powder', which is a complete bargain, and even if it doesn't work I've only lost 99p! The directions specify to only use once or twice a week, so I can see this tub lasting for a long time.
I'm going to use it twice a week for 3 or 4 weeks and then come back and do a review, complete with before and after photos to see if it has made any difference!
I'm pretty sure this can be picked up in most chemists; I was just lazy and purchased it online.