Shipments of Android-based tablets surged in the third quarter, led by Samsung and Amazon, which grew their share from 9.6% and 5%, respectively, in the second quarter, to 18.4% and 9%. True to form, Apple's keeping details of its Black Friday sale event under wraps, although the company's ad has prompted speculation that the iPad could be involved. Last year, the Cupertino, Calif.-based company offered discounts on the iPad 2, the iMac, iPods, and MacBooks. Apple shares crept up 0.21% to $562.11 in afternoon action on Wednesday. -- Written by James Rogers in New York. Follow @jamesjrogers >To submit a news tip, send an email to: email@example.com.