If you want a cheap locksmith expect a cheap service. If you are looking to get ripped off, this is the best way to go about it.
If you get an experienced locksmith, they will fit good quality parts that come with a guarantee, and will probably last you a lifetime, not cheaper, but better for you.
I am an experienced locksmith, and probably the only locksmith with an HND in engineering, so I am a qualified locksmith too.
I have lots of locksmith feed back, have a look here
I am not part of a national locksmith company or franchise.
This is my website – www.goldi-locksmith.co.uk