The entire Eragon series is is on sale for $5 or less at Barnes and Nobles:
The whole Wondrous Strange series is less than $6 a book at both B&N and Amazon:
$4.79 $5.69 $5.69
In my opinion, this is one of the better fairy series out there for young adults.
$1.99 on sale from $9.99
$4.99 on sale from $9.99. Dystopian goodness
$4.74 on sale from $8.99
$2.99 on sale from $9.99
$2.99 on sale from $9.99 one of my favorite recent books
Another series I love, The Madison Avery series by Kim Harrison are also all under $6. I really love this one and wish she would write a 4th book:
$4.74 $5.69 $5.69
What other books are on sale?