Is it possible to register multiple people with T-shirt sizes with your forms?

I am wanting to find out if our church can use your forms for Easter.  Do you have non profit pricing?

Yes, it's possible. To allow users to pick multiple sizes of the same product, you have to create Sub-Products. Inside of this guide, you can find how to do it:

Create Sub-Products Based on a Product Option

With regards to non-profit discount, please use this link to apply for a discount: https://www.jotform.com/nonprofit/pricing/ 

We will review and respond to your application as soon as possible. Unfortunately, I can not give you ETA, it's usually within the same business day when we receive it, but it depends on how many applications we have that day.

Let us know if you have any questions or if you need further assistance.