Wizard costs for learning new spells

[Diminutive Titan]

Suppose I want additional spells, and I have no scrolls to copy them from. How much does it cost me to get more lvl 1 spells?

Do I have to buy a scroll and then pay 10 gp to write it in my spellbook? Or do I just pay the 10gp?
Or do I have to pay 1000 gp? According to the "Independent Research" rules.

[jwtelesio]

You can either learn a spell by purchasing the level 1 scroll for 25g and spending 10g to scribe it for a total of 35g.

Pay another wizard to let you copy the spell for usually half the cost of inscribing it. Costing you 15g.

Or you could do the insanely expensive way of paying 1000g and learning it that way.

[Remy Balster]

You could also buy random spellbooks, copy the spells from that, then resell the spellbook for half price. This works out to the same cost as what another wizard typically charges to borrow their book, with the added bonus of not having a wizard standing over your shoulder being all overprotective and impatient about his book.

Or the cheapest ways: Claim one from someone else, or exchange spells with another wizard.

If you simply claim a fallen enemy wizard's book, you get easy cheap access, and you can still sell the book off after you copy everything out of it.

If you are on friendly enough terms with other wizards, you can swap spellbook access, they learn one from you, and you one from them, and you each break even at no cost.

Only use spell research for spells as a last resort. If you have an oddly restrictive DM, or if you siply cannot find a must have for your build spell somewhere, or if you are actualy making up a new spell. Otherwise it is a terribly expensive option, remarkably expensive.

Only use scrolls if you have trouble finding the spell in question in book form. This option is always more expensive than spellbook copying, and gets increasingly more expensive with higher level spells.