Putative Pricing 5mL vs 30mL

Hey I was browsing through the store today and noticed that the P83 price didn’t change when I changed the quantity from 5mL to 30mL. Same for P74 and P102. I assume this must be some kind of mistake (or a blessing from above), and I didn’t even know if these putatives came in 30mL. So can anybody tell me the true price/amounts of these items?

You went from a 5 ml at 12.5 to a 30 ml at 2.5. To get the same amount from the 30 ml as one spray from the 5 ml you need 10 sprays. Its vastly different.

i noticed the same and ordered P83 in a 30ml to add with AMMO, was this a good choice?