Barnes & Noble has permanently dropped the price of its color e-readers — both the Nook Color and 8GB Nook Tablet have seen a $20 price drop, bringing the totals to $149 and $179 respectively, while the 16GB Nook Tablet will now run you $199. Previously, the 8GB Nook Tablet was Barnes & Noble's answer to the $199 Kindle Fire, but with today's price drop the top-of-the-line 16GB model squares off against both Amazon and Google's offerings. If you were on still on the fence about the burgeoning 7-inch tablet space, Barnes & Noble now has some of the most affordable hardware, and each Nook model is in stock as of this writing.