CostCo have a £20 reduction (in the voucher booklet which started today) on the new TomTom XXL - it also comes with a case and full European maps:
Andorra, Austria, Belgium, Bulgaria, Croatia, Czech Republic, Denmark, Estonia, Finland, France, Germany, Gibraltar, Hungary, Italy, Latvia, Liechtenstein, Lithuania, Luxembourg, Monaco, Norway, Poland, Portugal, Republic of Ireland, San Marino, Slovakia, Slovenia, Spain, Sweden, Switzerland, the Netherlands, United Kingdom and Vatican City.
Also including the connecting roads of Albania, Belarus, Bosnia-Herzegovina, Macedonia, Moldavia, Montenegro, Romania, Serbia, Ukraine and the Russian Federation.http://www.tomtom.com/products/product.php?ID=967&Category=0&Lid=1
List price is £199.99. The case is listed at £14.99
The cheapest I can find it online is about £182 - and that's without the case, so imho, this is a bargain. It's pretty new to market, so not many stores other than costco have it.
Obviously after Jan 1st, the extra 2.5% VAT kicks in, making it about £164.50