There are no fees on cash/checks. You are able to add all cash/check donations for free.
This will help you track all donations as you can add a cash/check donation directly to a participant or your main campaign (e.g. a check from a business sponsorship).
Here are instructions for entering cash/check donations:
Log into your Admin account at www.99pledges.com/users/sign_in
Go to the Donations tab.
Click "Add Cash/Check Donation".
You can enter cash/check donations in total or by participant: