I made a few more changes, including fixing an embarrassing duplication error in one of the spell lists, added a new tradition (winter) and a few more spells. I still appreciate feedback.
peterka99, the prices for the potions are either strictly from the DMG (where the price is given, such as the poisons and the potion of healing) or within the DMG guidelines (other potions). I didn't intend for the witch to have any monetary advantage to crafting, but merely better/more sure access. While in general, I like D&D 5e's permission-required approach to magic item crafting, I wanted to loosen it up a bit for the witch. But note that the DM can still control the availability of non-gp ingrediants.
steeldragon, at one point, I actually wanted to follow both your suggestions, but ultimately didn't. The problem with choosing the late archetype, is that the witch depends on them to get tradition spells. I think this is the same reason why the cleric also starts at 1st level with its domain. At one point, I did delay the acquisition of the tradition, and instead of having tradition-based cantrips and 1st-level spells, I made them prerequisites for entry into a tradition. But at the end of the day, I decided it wasn't worth the additional complexity, and abandoned that approach.
With regard to using "tradition" as the class archetype, I felt kind of stuck. I wanted to contrast the witch's "passed-down" folk wisdom spellcasting as compared to the theoretical/book learning approach of wizards and the faith-based spellcasting of clerics. Really, I'd feel best if wizards went back to "schools"; but since WOTC probably won't honor that request, "tradition" was still the best I could come up with.
This is as good a place as any to note that the witch has substantially more spells known than the cleric or the wizard. I'm aware of it, but i think its balanced against the fact that clerics and wizards can switch spells much more easily (pray/study overnight to memorize a new spell), while witches take a whole month to switch out a spell.
PS to the mods: any chance of getting an upgrade to the resources database to allow posting of full classes?