Stainless Steel Brake lines for E28 535i (Allgemein)

Hi all,
Does anyone know a good, unexpensive source of stainless steel brake hoses for E28 535i?
I should replace the aged brake hoses (they are quite old, after 18 years) and I am considering Stainless Steel. Still, money is an issue :(
Any comment will be appreciated.

Thanks,
Robert

My E28 535i