Looking for small pre-built u-boat models

Hi,

I was wondering if anyone could point me in the right direction. I've got a boardgame I'm putting together for a little bit of entertainment for some friends of mine and I could really do with some small u-boat or other sub models to lend it a bit of flair.

I'm looking for anything about 3 inches or less (so I'm guessing 1/700th scale or less). What I don't really have time to do is built and paint them - so anything from Micro Machines-style quality up is acceptable. Die-cast or plastic, anything will do.

Anyone got any idea of the best place to look? Based in the UK.

cheers,

Fletch