The Chicago Groupon had Green Irish Tweed Fragrance listed as 49% off. Still too pricy for me, but fans of the fragrance might want to give it a look.
https://www.groupon.com/deals/
https://www.groupon.com/deals/
I live in stl so when I clicked on the link it took me to the stl site. Our groupon is for turducken and adult toys. I'm not even kidding. You chicago guys may smell better but we have more fun......apparently.
Searching Green Irish Tweed on Groupon brings up a lot of products. All bottles with different prices. I would be careful about buying.
To update, I got my bottle today. It's the real deal. All the normal markings and is identical to the sample I had from Sak's. As to how bottles wind up selling for comparatively little, googling of the fragrance grey market results in some articles that explain it pretty clearly.