Does PayPal offer nonprofit rates or fee discounts?
Yes, please check out https://www.paypal.com/charities for more information.
By simply confirming that your PayPal account belongs to a 501c3 (if based in the US), your organization will be given a special reduced nonprofit rate of 1.99%. + $0 .49 per transaction.
For more information and to apply for the nonprofit rate, please check out PayPal's website.