Manolo says, oh noes! Amazon is buying Zappos. Amazon.com is trying the shoe retailer Zappos.com on for size. The companies announced on Wednesday that Amazon was acquiring Zappos, based in Henderson, Nev., for 10 million shares of Amazon stock worth more than $800 million. Amazon also said it would give Zappos employees an additional $40 million in cash and stock. The acquisition is the largest in Amazon’s history. Online shoe sales hit $4.3 billion in 2008, up from $3.3 billion the year before, according to Forrester Research. Zappos, a ten-year-old private company that has won fans with perks like free…