Question about buying a tortoise

I have been recently tossing around the idea about buying a tortoise for my son. I had been searching for awhile and found a site that had some pretty decent looking sulcata tortoises.

I live in Maine and I know that a lot of species of animals are forbidden to own in Maine. So, I had a friend who also happens to be a game warden look into it for me so I could stay within the limitations of the law. We were both eating breakfast at the same diner the other day and I showed him a picture of the tortoise on the site. He called it in and it was confirmed that it was a restricted species and that I would have to get a possession permit.

However, he also stated that he wasn't very concerned with the species of the tortoise, but was more concerned with the size of the tortoise that they are selling. He stated that he believed that the tortoise must be at least 4 inches before it could be legally sold. He said he would get back to me about the law, but hasn't so far.

Is it legal for me to purchase a tortoise that is less than 4 inches?
Is it legal to sell a tortoise that is less than 4 inches?