Online shoppers browsing at o.co (the company formerly known as Overstock.com) can be overwhelmed with the staggering spectrum of discounted merchandise. The site sells 960,000 products, including jewelry, sporting goods, furniture, luggage, electronics, books, shoes, office supplies, clothing, gift baskets, and too many others to name. Some of the online retailer’s deals are better than others, with discounts ranging from a measly 5% to more impressive markdowns of well over 50%. Also impressive: Overstock’s 23.8% jump in sales from 2009 to 2010.