For the next three days, from April 20th through April 22nd, Barnes & Noble is offering 25% off on pre-ordered books.
That means you can get the hardcover of Councilor https://www.barnesandnoble.com/w/councilor-l-e-modesitt-jr/1140183159?ean=9781250814456 or the mass-market edition of Isolate https://www.barnesandnoble.com/w/isolate-l-e-modesitt-jr/1140126538?ean=9781250777423 at a discount.
The check-out code is PREORDER25