B&M – Carmarthen – Opening Hours & Store Details B&M Store lies at 6-7 Hall Street, a 0.23 mile driving distance east of the centre of Carmarthen (close to Carmarthen Bus Station). This discount store is available for the people of Carmarthen Junction, Johnstown, Carmarthen Town Centre, Abergwili, Carmarthen Bridge Junction, Llangynnwr and Pensarn. Read the specifics on this page for B&M Carmarthen, including the hours of business, location details, direct phone and further details.