Was in Waterstones earlier (Ilford), picked up the Teach Yourself Spanish grammar, verbs and vocabulary books bundled together for £12.99, RRP was £28.97. The books by themselves cost £8-£12, so was quite a saving.
They had one French one as well and one Spanish one left, not sure about other languages.
Not sure if this was store specific or nationwide... But good luck finding it if you are interested!