I happened to passing by the local pet shop a week or so ago, and spotted stainless dog and cat bowls for just a couple of quid.
I chanced my arm and give one a try and it's proving to be really good. The one that I bought is approx 130mm in diameter at the base, widening to 170mm at the top x 75mm deep and I guess that the only negative is that you need a detachable pot handle, and the stainless goes blue quickly.
If you are on the look out for cheap pots, don't rule out places such as pet shops.