Never heard of anything for attractions in Paris.... maybe Groupon and La Fourchette for restaurant discounts, that's about it...
Since the online Eiffel Tower tickets sell out very quickly, weeks before the date, I can't imagine they need to discount them. Similarly, the Louvre has a long line of people waiting to get in nearly every day.
I associate markdowns & coupons with a product that isn't selling well & needs to be encouraged. That's just not the case with the main attractions in Paris. I'd be very surprised if anyone posts links to discounts.
If you're planning to visit lots of museums, you might want to price the Museum Pass to see if it would be a good deal for you, though.
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