NonProfit Rate is free resource dedicated to helping find the best rates and resources for nonprofit organizations and nonprofit employees. The site stays on top of the suppliers that offer the best discounts to 501c(3)s, as well as unique or free resources that can help organizations thrive.
GoodMerch was founded to help nonprofits raise funds and build awareness by taking the hassle out of T-shirt and merchandise sales. GoodMerch helps organizations develop profitable merchandise programs and provides organizations a free online store to sell T-shirts to supporters. They handle order processing, printing and shipping. Their print-on-demand technology eliminates waste by cutting out the need to stock inventory, allowing organizations to raise funds on every sale.
AmazonSmile is a website operated by Amazon with the same products, prices, and shopping features as Amazon.com. The difference is that when you shop on AmazonSmile, the AmazonSmile Foundation will donate 0.5% of the purchase price of eligible products to the charitable organization of your choice.
FoodTank's List of 30 Resources (Includes some international resources):