The good news is there are some A's and B's, but mixed in with a class of good and up-and-coming office supply companies there some pretty bad eggs.
Nonprofit Forest Ethics has emerged as one of the leading watchdogs of the paper industry. Their paper Report Card looks at several factors: the origins of the paper a company sells and how those forests are managed, where those forests are located, use of sterile tree farms, responsible forestry certification, recycling and reduction, and other environmental leadership.
Or I can save you some time... FedEx Office and Office Depot get a big thumbs up. CostCo and Amazon.com are at the bottom of the class!