Hi there - I don't blame you for not buying food at Makro. Particularly now it has been taken over by Booker. Previously the occasional pork shoulder for sausages but that was about it. A one stop shop for purveyors of, as my French friends say, Les Burgers du Mort.
Metro couldn't be more different. It's embarressing the difference! Very much for the professional restaurant and hotel trade. There are similarities of course in that it is a warehouse but that's about it.
Metro sold 90% of Makro to Booker's but have retained the other 10 - hence you can still get access. Typically you will have to present a passport at entry ( Calais keep it for the duration) and sign a chitty giving access. This chitty is presented at checkout, etc, etc. Just don't forget to collect your passport on the way out as we, very nearly, did.
Obviously you"d be buying catering sized quantity but between a group of you that shouldn't represent an issue. Specific examples - wines/berrs/spirits approx. 40% less than French supermarkets. It varies of course but I'd say that's a reasonable average. Where we make the greatest saving is with meat/fish/cheese. Top notch quality, prepared beautifully, and in most instances less than half of the French high street/supermarkets.
www.metro.fr. will let you browse some of the website. We managed to blag a French card several years ago which gives full access to the website and easier access to the stores. The Boulogne store were more accommodating in this regard.
I couldn't recommend highly enough that you take a look. On top of everything else the people working there are genuinely friendly too.