The eight potions weren't something rare. However, there is always a demand for them since medicines from the real world can't be brought inside the Arcane World.
These potions are still considered a must-bring item in long explorations. Cyril can even remember their prices right now.
( Grade 1 ) Pain Relieving Potion – 550 Ains / bottle
( Grade 1 ) Tranquility Potion – 350 Ains / bottle
( Grade 1 ) Defense Potion – 480 Ains / bottle
( Grade 1 ) Insanity Inducing Potion – 250 Ains / bottle
( Grade 1 ) Hunger Inducing Potion – 200 Ains / bottle
( Grade 2 ) Sleep Inducing Potion – 480 Ains / bottle
( Grade 2 ) Night Vision Potion – 450 Ains / bottle
( Grade 2 ) Weak Antidote – 800 Ains / bottle
Out of the eight potions here, Cyril already taught two of them to Bonnie.
They are the Night Vision Potion and Weak Antidote.