A reward scheme is in operation at Games Workshop called "Citizen's Reward" - it could be a good time to buy your new Warhammer Skaven Fantasy Battle Army !
You need to register on Games-Workshop.com to qualify (I haven't checked all the GW sites but I presume the offer is active everywhere, it certainly is in Europe and the US)For the UK and Europe... for every £100 / euro 100 you spend between 1st and 15th Dec you get a £10 / 10eur voucher for money off your next purchase (but it must be used between Sat 26th Dec and Sunday 31st Jan - that's the catch !). For the US it's $15 for every $150.
There's another thing too, free shipping for orders over £10 / 10eur / $15 US / $20 CAD for most of December (although it depends where you are in the world). Also, if it's a problem shipping to your home or work they'll ship to your local hobby store.
Just check out the home page on Games-Workshop.com for your country's GW deal.