Ultimate Power for $19.99 (plus tax)

Come in to my modest and humble bookstore
Everything's on sale as is posted on the door,
Feel free to look but may I suggest
That book on that table is the best!,
Look at what the front cover reveals!
Forbidden knowledge of the magical fields!,
Secrets shared exclusively with the buyer
Formulas' in detail to take you so much higher!,
See where it says it contains powerful spells
One to banish demons and one with coffin nails!,
Instructions of power commercially reproduced
Such a possession will give your life a certain boost!,
No one will ever again stand in your way
With a few incantations they'll vanish without delay!,
This is definitely a book that I'd recommend
Such a purchase of $19.99 won't happen again!,
Only three million copies sold worldwide!
Buy it now and jump in for the magical ride!,
Will that be cash or credit card for this wondrous book?
Hide its secrets well so none will see it nor have a look!