At $72.99, this Wacom Bamboo Capture Pen and Touch Tablet (CTH470) is at it's lowest historical price. Over 800 customer reviews give this an excellent 4.5 star average.
Before the discussion blows up against me below, I should say that I absolutely do not really believe a Wacom Tablet can replace a crisp HB and sketchpad. I do think these devices are must-haves for any graphic designer or illustrator, though.