domain .com - Croporg.com

The org and .com combination is rather confusing and that makes it less viable an option for end user. Specially when org in itself is a popular extension, this gets confusing.
Reg fee name.

Hmmm...Not unsellable, but not the hottest domain that I would think. Very tough to predict but why not a low $xxx, but not too easy.

Nice try, but I would try again. And .org could be a good TLD for your purpose. Perhaps you will have more possible options than in .com. Also think how this name would be advertised or spelled on the radio. Shorter is not always better. Maybe you could use the keyword organic in full, it is less ambiguous than just saying org.