Sorry, just the cantrips from the core book.
This is a spellbook from a killed enemy, loot. Glad I asked about this: my calculations is based on the following:
-spellbook: 15 gp
-20 0 level spells, cost to buy 12,5 and writing cost 5 gp = 17,5 *20 = 350 gp.
-6 first level spells, cost to buy...