Okay, I'm a wizard. How do I get more 0 level spell slots?
So far, I can see the split slot discovery trading a 2nd level slot for 2 0 level slots. Does anyone know any other options?
If you've got 11+ charisma, take one level of Sorcerer. You get a whole bunch of cantrips known, plus the bloodline arcana of the sorcerer, some bloodline powers, eschew materials as a bonus feat, UMD as a class skill, and a few 1st level sorcerer spells. You do have to sacrifice a caster level to do this, though, so the tradeoff is pretty steep.
I don't think a homebrewed feat or trait allowing 2 or 1 additional cantrip or orison per day would be out of line.
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The various character class tables show how many spells of each level a character can cast per day. These openings for daily spells are called spell slots. A spellcaster always has the option to fill a higher-level spell slot with a lower-level spell. A spellcaster who lacks a high enough ability score to cast spells that would otherwise be his due still gets the slots but must fill them with spells of lower levels.
Emphasis mine. So you can sacrifice a Level 1 slot for a cantrip.
There is a feat, Extra Cantrips or Orisons.
That adds extra cantrips known; it's not helpful to a wizard who already knows every cantrip on his class list, and is limited by the slots in which he may prepare them.
Technically they're SLA's, but Arcane Talent gives you another cantrip 3/day.
I believe your best bet is the Cracked Orange Prism Ioun Stones. 1000g for each prepared cantrip you wish to add to your list. Half that for crafters of course.
Mnemonic enhancer can give you six extra cantrips a day.
The description of the Ioun stones I mentioned allow you to add them to the list of spells known or spells prepared. Once prepared, they can be cast at caster level at will. It's not that hard. 1000g each.