One of my all-time favorite time travel romance series is the Out of Time series by Monique Martin. With the exception of the first book, I've paid full price for each of the novels because I love them so much, I can never wait for them to come on sale and they seldom do.
Imagine my surprise when I find that the first three novels are FREE right now! Well, I can only tell you to GRAB THEM NOW. Honestly, I think you'll love them.
Here is the Amazon link.