Cheaper alternative to this?

[NStocks]

Hi,

I'm looking for a aluminium case that I can keep my macbook pro in whilst in use.

I've found a really good one, perfect in fact but it's way to expensive. I'm looking for something that does the same job as the one below at half the price.

http://www.raidius.com/UK/Portable/mactruck.html

Any suggestions?

Thank You