QVCUS still sell and TSVs. QVCUK moved to the cheaper Magnitone(which I have seen in TKMaxx much cheaper), instead. L'Oreal bought out Clarisonic a few years back, they started turning up on Lancome counters. My branch of House of Fraser had them at half price last month. I bought a new one in July, even though my original is still working now use that one for body. Heads wise you can buy them on Ebay for about £2.50 and the ones I bought are the genuine thing though the seller was wise just calling them replacement heads not mentioning they where real. I got 4 heads for £9.99(the more you bought the better the deal), so shop around.
Electric/sonic toothbrushes are the way to go. I get my replacement heads from Amazon subscribe and save, mine is a Philips and I prefer the smaller heads. But Boots usually have some sort of deal on the Braun or Philips.