Monkey DVD Box set - Complete series is £44.93 delivered, from Asda Entertainment.
Also 2.5% Quidco is available.
Next cheapest is £59.97 from Amazon.
Play are out of stock at £79.99 and WHSmith are trying to sell it at £99.99 !!!
OK, Sendit are 4p cheaper (but they won't have any, and don't do Quidco for old customers).
I'm sure it's been cheaper, but I can't find a posting on HUKD for it (within the last 3 months).