Hi, apologies if this is in the wrong place, but I tripped over this a couple of days ago and would like to share.
Diane Duane is an awesome author of YA and regular fantasy and science fiction, and apparently has her own website ....
http://ebooksdirect.dianeduane.com/
where she offers a selection of her books in DRM free epub and kindle formats for great prices. I got "Stealing the Elf King's Roses" and am quite enjoying it.