Texas Destiny, Texas Glory, Texas Splendor (3-in-1 book)

I loved Houston from the moment he went to get Dallas's mail order bride and did not think I would love Dallas at all. Boy, was I surprised! Dallas turned out to be a beautiful person especially with his new bride and the little boy they eventually adopted. I was glad Houston and his wife appeared regularly in Splendor. I have both books in hardcover and read both last year but the book I really want now is the third book of the trilogy about Austin. I was told by a clerk at Borders bookstore that the book is now out of print but I could get the book for seventeen dollars at some warehouse. I didn't just fall off the turnip truck baby. I need to know the name of the book about Austin and where I can get the book at a reasonable price. Lorraine Heath, you are a beautiful writer and I will always buy your books. Thanks and keep the books coming. Toni