I went to the Lindt store today. The "exhibition" is closed for renovation, but it you ask about it at the counter, they will give you some chocolate as a consolation prize, so you should definitely do that
Most of the items in the store are regular packaged items, at about 20% off the Coop price. However, they had various specials and deals:
1. combo deals: 50g chocolate bunny (2.75 at Coop) is 2.20, but you can get 5 for 10F
2. out of season: chocolate Santas and other Christmas items were very cheap (more than 50% off) (but Valentine's day items weren't discounted yet (?))
3. bulk packs: fancy pralines in plain 320g bags, 3.90 each or 4 for 12F; 500g Double Lait 7.50
4. seconds as mentioned: Petit Desserts where the filling may be showing (or I think some of them may just be short dated) 1.50 each
5. large prepicked assortments of packaged items - I didn't note the details, but they seemed like good deals if you like the assortment - for me they were too milk chocolate heavy
I found it easy to get there by bus, but note that they only run every half hour, so pay attention to the schedule if you are short of time.