Wizard's survival book
 

Contains a few useful spells. Usually found "written" in blue ink, so be careful!

IQ 8: Detect Magic, Light, Staff
IQ 9: Dark Vision, Detect Life, Look Your Best, Summon Scout
IQ 10: Adhesion, Detect Enemies, Lock/Knock, Meal, Minor Medicament, Stalwart, Trailtwister, Ward, Whisper
IQ 11: Delete Writing, Ferment, Reveal/Conceal, Scour, Sleep, Staff II
IQ 12: Analyze Magic, Cleanse Poison, Drain Strength, Pathfinder, Repair
IQ 13: Open Tunnel, Scrying, Staff III
IQ 14: Duplicate Writing, Glamor, Remove Thrown Spell, Restore Device, Telepathy

385 total pages, 25 pounds.
Legitimate copies cost $7,700 and are slightly less likely to include meaningful errors.