Just been at the Oxford store, they've had them in stock while at £1 a pack but obviously they weren't shifting! I've seen them at couple of works I've visited recently, so should be nationwide :)
I saw Clone wars, Order 66, Tactics and Ground assault boosters, and most ebay sellers are selling them 3 for £5. More info here:http://en.wikipedia.org/wiki/Star_Wars_PocketModel_Trading_Card_Game
A few packs should keep older kids entertained!