The problem with the potion-making rules is, they're ambiguous. If you follow the Magic Item crafting rules on p. 129 of the DMG, and you want to make a Potion of Invisibility (classed as a "Very Rare" item), it will cost you 50,000 g.p., and take you 2000 [sic] days to brew .If you follow the stipulation on p. 135 that one-shot items have half the cost of permanent items, that doesn't change things substantially.
If, on the other hand, you want to pen a spell scroll with the Invisibility spell on it (same effect, main difference would be that it takes an action to read a scroll, but a bonus action to quaff a potion), it would be classed as an "Uncommon" item (2nd level spell), cost you 500 g.p., and take you 20 days to manufacture (1/2 the time for one-shot items, as per p. 135).
So I "get" why they wanted to make Fly and Invisibility potions cost more than the others, but from any rational viewpoint, no NPC wizard is going to spend 3 years manufacturing an invis potion at this rate when she could simply write a mess of scrolls, or make house calls to whomever wants to become invisible. The rules according to the first reading are an example of poor design. If they wanted to make invisibility and fly that difficult to come by, they should have changed the levels of the spells in question for 5e. But they kept the level the same as in previous editions - they just jacked up the prices.
So I decided to follow the second path - potion prices are comparable to scroll prices. I don't take the argument that "PCs should be adventuring rather than mass producing potions" particularly seriously. First - 10 days a pop is hardly mass production. Second, being able to brew potions increases role-playing possibilities, not allowing PCs to do so in a reasonable time limits them. You can learn about where to procure materials, competitors' supply networks, unscrupulous producers, and a whole host of other interesting things.
So I threw together a price and component list for some basic arcane and druidic potions (derived from 1st and 2nd level spells) on the basis of the potion-brewing rules outlined in the Dresden Files (not a huge fan of the series, but I like the potion-making rules for D&D). The basic premise is, all potions have eight components - a liquid base (l), a component representing each of the five senses (si - sight, h - hearing, sm - smell, to - touch, ta - taste), a mental (m) component, and a spiritual component (sp).
Attaching the full list here.
EDIT: fixed typo.