There are several notable deals on Amazon.com
I'll list those that are not repeats (to me, at least)
Dealing with Dragons by Patricia C. Wrede - $2.99 -
Link
First part of a series. Comes recommended by Jo Walton as "one of the most delightful dragon books ever"
Mythos by Stephen Fry - $3.39 -
Link
Fry's retellings of the Greek myths (part 1)
Akata Witch by Nnedi Okorafor - $2.99 -
Link
Previously published as "What Sunny Saw in the Flames". YA. Part of 2 book series
The Borrowers by Mary Norton - $2.99 -
Link
First in a classic Children's series