At Walgreens stores, Lindt chocolate bars are on sale through Saturday, May 28th at the price of 2 for $3. There is also a $1 off 2 "instant value coupon" available in stores, resulting in the lowest price I've ever seen for this chocolate: only $1 per bar.
At this price, it is only $0.28 cents per ounce, making these bars a superb value, as you can see on our best chocolate values page. Our postings about Lindt chocolate bars can be found by clicking any Lindt label, or you can go directly to our reviews of the Lindt Excellence 85% and 70% bars.
This offer does not appear to be available online, so you'll have to check at a Walgreens near you. Here is their store locator. This offer seems to be available everywhere in the U.S., but I've only confirmed it locally in Seattle. Please add a comment if you find it is not available in your area.