Amazon have 33% off a good few sets at the moment. The odd (great) thing is, the 'Super Saver Free Delivery' that is usually a UK-only offer is eligable on orders to Ireland too (it still says UK only but I can confirm I have availed of it as of today ) so these prices are inclusive of delivery.
The 2010 Harry Potter sets are down:
4842: Hogwarts Castle: £69.01 (works out €81.85; the set retails here for €120, Argos had it for €135 when it came out).
4738: Hagrid's Hut: £27.46 (€31.15; retails here for €49.99)
4840: The Burrow: £41.53 (€45.98; retails at €74.99 here)
4841: Hogwarts Express: £52.00 (€58.99; retails between €90-100 depending on where you go here).
Away from HP, there's the City theme. See the full range here. For example:
7939: Lego City Cargo Train: £87.10 (€98.81; retails here at €149.99)
There's also 33% off the Star Wars line (see the full range here including:
8097: Slave I £54.94 (€62.33; retails here at €90-100)
8098: Clone Turbo Tank £69.01 (€78.29; retails at €115 here).
Anyone in the market for a cheap train? There's 53% off the Toy Story 7597 Western Train Chase. It is £38.57 delivered, which works out at €43.75. Retails at around €100 here.