The Mad Alchemist

The Mad Alchemist is has the largest selection of Potions in New Cross.

List of 5e Spells
Any spell can be found in potion form. The cost for a potion depends on the level of the spell you wish to replicate.

Cantrips 25gp
Lvl 1  55gp
Lvl 2  80gp
Lvl 3  135gp
Lvl 4  160gp
Lvl 5  215gp
Lvl 6  240gp
Lvl 7  290gp
Lvl 8  320gp
Lvl 9 370gp

Here are a few examples of potions.
Potion of Animal Friendship
When you drink this potion, you can cast the animal friendship spell (save DC 13) for 1 hour at will.

Potion of Diminution
When you drink this potion, you gain the "reduce" effect of the enlarge/reduce spell for 1d4 hours (no concentration required).

Potion of Flying
When you drink this potion, you gain a flying speed equal to your walking speed for 1 hour and can hover. If you're in the air when the potion wears off, you fall unless you have some other means of staying aloft.

Potion of Gaseous Form
When you drink this potion, you gain the effect of the gaseous form spell for 1 hour (no concentration required) or until you end the effect as a bonus action.

Potion of Invisibility
This potion's container looks empty but feels as though it holds liquid. When you drink it, you become invisible for 1 hour. The effect ends early if you attack or cast a spell. Anything you wear or carry is still visible.

Potion of Water Breathing
You can breathe underwater for 1 hour after drinking this potion.