[Radek]

1. Right now, you can buy better spells in Trademeet but you'll have to solve the Trademeet problem first.
2. Ribald will sell better spells later - in chapter 6.
2. A few of higher level spells are fixed treasures in the game. Most of higher level spells are random treasures. You cannot buy them at all. In the other words, the contents of your spellbook is always a matter of a random roll. Completely wrong? Sure. Use CLUA Console.