Potion of Animal Friendship: You've priced this at 100. Scroll users can pay 40gp for it. It should be double the cost for non magic users to use spells imo. I'd argue for 150-200% more, depending on spell.
You should do the same for Gaseous form - I suggest 150% more.
Potion of Diminution - I suggest 200% more due to the lack of concentration requirement.