Just got back from my local hmv where I picked up the special editions of 'The Two Towers' and 'The Return of the King' for £4.99 each. Last week they had 'The Two Towers' for £20 instore.
The Two Towers for £5 instore is most certainly the cheapest I can find it for.Unfortunately it's still £18 on hmv online. Amazon market place is the next cheapest for approximately £7.
This is following the post I did last week for the fellowship of the ring still £3.99 online:http://www.hotukdeals.com/item/370535/lord-of-the-rings-fellowship-of-the/