Amazon offers Prime members Tom Alphin's The LEGO Architect Hardcover Book for $9.96 with free shipping. (Non-members can spend $25 in books or $49 in general merchandise to qualify for free shipping; otherwise, shipping costs $4.98.) That's tied with our expired mention from five days ago and the lowest total price we could find by $4. It explains seven architectural styles through LEGO models along with directions for building select models.