I buy the blades from eBay but I got the razer from a wesbite called The Shaving Shack.
I use this one: http://www.shaving-shack.com/shop/product.php?productid=2611&cat=133&page=2 however it was only £12.99 when I bought it, for £19.99 there are probably better ones on there.
Cool

I somehow found that site, and someone quoted the Merkur 34C, but that is £22.