We’re mainly covering this one due to the jilted buyer… Greenfield Online, a provider of online market research, says it’s nixing its sale to media PE firm Quadrangle. The company had already indicated that it received a potentially higher offer than the $426 million or $15.50 per share it was set to get from Quadrangle. The new buyer, an un-named Fortune 100 firm, will pay $17.50 for the company. Per the original agreement announced in early June, Quadrangle will get a $5 million fee for its troubles. Quadrangle could still increase its offer if it acts before August, 29. Release.