It is not neccessary to go over the 25 volunteer amount in order to upgrade to a paid plan. You can upgrade at anytime.
While logged in your Organizer Dashboard there is an Upgrade link towards the top right by the Account link. Here you can choose if you want to pay the monthly rate or for the entire year and recieve a 20% discount.
Once you have decided what plan and pricing method you want you can just add your credit card into the system. You will then receive a receipt in your email (it can sometimes go to the spam or junk mail box so be sure to check there as well). You can change the card or cancel at any time.
In order to pay by check, email us directly.
*Note to organizers wanting to start multiple sites and have them under the same umbrella Organization, this is a Group Plan and you should contact us directly for those rates.
This is the pricing list: http://www.trackitforward.com/payment/free