Mimi Matthews writes Regencies and Victorians with good period detail. She has a couple of books FREE right now and a couple of others on sale for $0.99.
Free:
The Lost Letter
The Viscount and the Vicar's Daughter
$0.99
The Work of Art
A Convenient Fiction - This is Book 3 of her Parish Orphans of Devon series. I've read book 1 and 4, thought book 1 was a decent start to the series, and loved book 4.