With the holidays just around the corner, retailers are striving to draw in customers. Today, December 13, marks another big shopping day - Green Monday, according to CBS News.

Green Monday is a term coined by the online shopping. site eBay, and is similar to Cyber Monday.. The phrase was created because the second Monday in December was typically the best day of sales for eBay.

The research group ComScore denotes Green Monday as the Monday that occurs at least 10 days before Christmas. According to the news source, shoppers spent approximately $854 million on Green Monday in 2009.

"FedEx says that this is the busiest shopping day for them," consumer correspondent Susan Koeppen told the news source. "It is a monster day for shippers, as well. Put it into perspective: FedEx says it will handle 16 million packages today alone. That's a 12 percent increase over last year."

Another sales event is on the horizon. Free Shipping Day, when many online merchants will offer shoppers a way to save online by avoiding shipping charges, is on Friday, December 17.