Next best price = TaxFreeDVD @£65.99
This only came out in April, so it's a fairly large saving on a new box set.
Dvd.co.uk are doing great deals (compared to other stores) on most of the the Midsomer Murders box sets at the moment:
Midsomer Murders: The First Collection = £34.99 (the next best price is £44.95)
Midsomer Murders: The Third Collection = £34.99 (the next best is £42.75)