For those looking, I thought this was quite a reasonable price, taking your chance with customs, but don't see it an issue at that value!
http://www.ebay.co.uk/itm/Tamiya-74024-Thin-Blade-Modeling-Razor-Saw-Craft-Tool-Plastic-Model-Blades-NIP-/350821790432?pt=UK_ToysGames_ModelKits_ModelKits_JN&hash=item51ae9bb2e0