The maps are too large to fit on a flip mat, and James Jacobs has previously said such an accessory would be cost prohibitive, so there no physical maps to buy. You can draw the maps by hand on poster paper or a wet erase mat, get them printed at a print shop, or use a VTT software like Foundry.
I can also recommend Narchy's map remakes if you want to print out maps.. The Foundry module uses them and they're beautiful.
When in a shop it mentions spells are for sale. What does that mean. A scroll? Or a spell to add to a spell book? Both?
Spellcasting Services. The NPC there will charge money to cast a spell for the party (such as Remove Disease after everyone gets bitten by ghouls, for example).