The supermarket is about 5 min drive from the Le Mans. (except on Sat - where it can take you upto and 2 hours to get back! - GO EARLY)
I think if you do a search on the web you can get the address with a map and print it off.
You can buy tickets at Carrefore, as you go thru the main entrance, there use to be an event ticket desk, straight in front of you and to the right and they sell le mans tickets. We got our entrance tickets from them last year. Not sure if it is any cheaper
Beer - I think they sell a bit of it !
Have a good one, and have a beer (or 2) for me, as I have to work this weekend. Behind on a big job, and I work for myself - I can only blame me.