Eve & Larry's Alchemy is an alchemy shop in a town near the Redmountain Hills. They had the bad habit of selling their potions at a lower price than they actually produced them hoping that the augmented sales would make them rich, although Vaarsuvius attempted to make them see the fallibility in their logic.
After that V bought a Potion of Mage Armor and 27 Heroism potions.
Trivia: a significant reference to the circumstance in which he bought the potions were made in strip #421.