Good Budget Car dealers

Hello,

Do you know any good car dealers in Cardiff that sell cheap cars? I am tight on budget and I passed my test recently so want something that is good for 2 years or so really.

I went to three dealers so far and had terrible experiences, two lied about what is normal in a car and all three wanted to sell at a much higher price than the cars worth.

Do you know any dealership that is actually trustworthy?