Kobo have two coupons that expires tomorrow ( I think.): Springromance for 75 % off ( it says Harlequin, but I got one of Jaci Burton's Sport Romances. But they might have fixed it) and Springsave80 ( from a list, but worked on a book outside the list)
Ilona Andrews offer A Questionable Client for free on her webpage for a limited time. Or you can buy it in Magic Graves for 2.99 at most places.
Dragon Virus by Laura Anne Gilman is 50% off on Book View Cafe. ( Not technically UF, but I have heard good things about it. Ends today!)
Halfway to the grave by Jeaniene Frost is 1.99 right now ( lasts until June 6th.US only, probably.)
I discovered that John Hartness The Black Knight Chronicles are available in an omnibus for 10.99. ( A bargain, considering the individual novels sells for 7.99) If you haven't tried his books, he also have several Short stories available for 0.99. ( Although it is probably better value to get one of the collections for 2.99)