If you're just hearing about Green Monday like myself it's basically Cyber Monday 2.
If you're looking for some deals today there are a bunch...
Best Buy: Aside from being Green Monday, it’s also day 11 of “20 days of Doorbusters.” Find the deals, available in-store and at BestBuy.com.
Dick’s Sporting Goods: Take $20 off $100 orders, $35 off $150 or $50 off orders $200 or more online or in-store with a coupon posted DicksSportingGoods.com.
J.C. Penney: Take an extra 25% off orders under $100 or 30% orders over $100 with promo code 7HURRY. Online only.
Macy’s: Take an extra 10-30% off select items and get free shipping on orders $25 or more at Macys.com with promo code FRIEND.
Target: Save $20 for every $100 spent on accessories, home, beauty and more at Target.com.
More Tips Here (USA Today)