Foam blades - cheap source ???

[Mikej]

I'm very much in the learning / crashing stage still and hence I like the standard foam blades as they are a "weak point" in the drive train and have taken the brunt of my collisions so far rather than passing the impact through to the head or main shaft etc. The only down-side of this is that I am getting through them pretty quickly - does anyone know of a good cheap source for them ?? I am in the UK but happy to buy from US / Europe / Far East - but looking for cheap.

Thanks (did I mention that cheap is good),

Mike.