Black Friday is always a great day to buy a new laptop, and it's no exception today at Lenovo . If you're in the market for rugged portability, the ThinkPad X220 might suit your needs. And you can score it today for 25% off with coupon code DOORBUSTER3. If you need a solid, basic model that can handle your small-business startup's needs, check out the E420. Then, use coupon code DOORBUSTER4 to knock 15% off the price. And if you prize better graphics and a larger screen, take a look at the T520. It can be yours for 25% off today with coupon code DOORBUSTER5. Valid through 11/25/2011.