Via Book Bub, I see that the Sunwolf and Starhawk trilogy by Barbara Hambly is on sale right now — $2.99 for all three books.
First book:

An excellent fantasy. When the men of a town are enslaved, the ladies of the town decide they’ll do whatever it takes. Including making a mercenary an offer he can’t refuse, to train them to fight.
Second book:

Possibly even better than the first book. Mysterious murders, curses and demons, and especially well-drawn secondary characters.
Third book:

Not my favorite of the three, but a decent conclusion to the trilogy.
Well worth $2.99. If you don’t already have the trilogy, grab it quick while it’s available at this price.
And it’s already back up to $19.83!