I just finished reading Isabella by Loretta Chase. It's only $.99 right now on Nook and Kindle. The cover isn't great and I noticed the formatting is a little off, but the story is classic Chase - an excellent read.
I haven't read this yet, but I just downloaded Vanquished by Hope Tarr. It's free on Nook and Kindle.
Heart of a Knight by Barbara Samuel, which won the 1998 Rita for Best Historical Romance (short category), is now $.99 on Nook and Kindle.