maternity and nursing clothes

Being a foreigner, I don't know which stores sell maternity or nursing
stuff, particularly at the cheaper to middle end of the market, we live
in a relatively up market place and other than motherhood maternity (and
even then it had mimi maternity with triple the prices in the front of
the store), everything is close to giving me a heart attack!

I'd particularly like to hear of sources of nursing basics.

Thanks
Anne