Morning,
searching for nearly one hour but not getting what i want, so hopefully you can help me:
Every Item you get on a chronicle sheet is available for purchase at once, that is clear. In Addition, all "always available items" are available.
On top you can buy an item when you have enough fame to get it from your faction.
If you want to buy an item from an additional source, you have to own a hardcopy or (a print out of) a legal pdf.
But what about the stuff on the chronciles, which becomes available at once to you, that is coming from an additional source?
If it is available at once, it should be available whether you own the book or not. Giving players items they have to pay for (because they need to own the source) would be quite greedy from paizo.