HarperCollins seems to be playing with their prices, but isn't announcing the bargains anywhere that I can find. If anyone sees lists of these somewhere, please let us know!
The C. S. Lewis classic
Mere Christianity is $1.99 at
B&N,
Amazon and
ebooks.com. If you buy it from ebooks.com, you can download it in both Adobe DRM-protected PDF and EPUB formats.