The Psychology of Human Sexuality by Lehmiller, Justin J.

A nice touch in this textbook is the chapter-opening vignettes that hook your interest.

Intimate Relationships, 3rd Edition by Benjamin Karney (2019, Trade Paperback)

A nice touch in this textbook is the checklist of learning outcomes at the start.

Collapse: How Societies Choose to Fail or Succeed – Hardcover – VERY GOOD

This unbranded textbook might not have a fancy cover, but the content is solid.

Exceptional Learners An Introduction to Special Education – 9780137520350

A nice touch in this textbook is the running glossary in the margins.