Just wondering if anyone can recommend a good place to get cheap foam for making seat cushions.  The back seat in my van is beginning to show it's age and I wanted to replace it as the van still has a good few miles in it (I hope!).  Foam has to be firm enough to sit and sleep on. 

Companies who deal over the web would be ideal as I live on an island and don't get to the Scottish mainland much....

Cheers