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I just bought four Oral B Vitality Sonic electric toothbrushes from the Co-op Pharmacy (they are only £9.99 - think the RRP is more like £30!) and used this discount code that I found on HotUKDeals.
Enter CPHJ3 at the checkout and you get £5 off if you spend £35 or more. According to HUKD it expires on 6th September. I also got free delivery because I spent £30+. Worth checking out!