Yes, at 14 rue Rambuteau (75003) ... it's an excellent bakery.

I think Monoprix is closer to Marks & Spencer than BHV, but that's a personal opinion. I braved the crowds at the new Uniqglo store near the Opéra about a month ago and was looking at their cashmere sweaters (the ones by Jil Sander) that are well-cut and not outrageously expensive. A very chic blond Parisian was rifling through the piles of sweaters next to me and turned to the sales clerk and sniffed "I've seen the same thing with better quality for half the price at Monoprix" and huffed off ... I don't know if she was right, but you can indeed find lots of things at Monoprix (I know a lady here who swears by their long silk "thermal" underwear).