Incredible Scale Finder: A Guide to Over 1,300 Guitar Scales 6 X 9 Ed. Hal Leonard Guitar Method Supplement

this book is perfect for learning scale positions-yes it shows the same scales in different keys, but that does not make it less helpful and its only 7 dollars. the thing i like best though is that it also shows a chart for what chords are included in what key (which i havent seen anywhere else) and what scales work best with this key. should help with composing, practising in general, obviously learning your scales, and figuring out songs on your own rather than having to buy sheet music.