This is a 6-book assortment from Printers Row Publishing Group (PRP), a San Diego-based publisher whose imprints include Silver Dolphin Books, Thunder Bay Press, Canterbury Classics, Studio Fun International, Dreamtivity, and Portable Press. Sold exclusively at Costco, this value-priced collection brings together six books under the "Ultimate" line, offering an outstanding breadth of content at a compelling price point of $9.99 for the full set.

Printers Row Publishing Group is well-known for producing high-quality children's books, activity books, adult reference titles, and licensed products sold through Costco warehouse locations. Their Silver Dolphin and Studio Fun imprints specialize in interactive and educational children's content, while Thunder Bay Press publishes adult reference, craft, and activity titles. The "Ultimate" series from Thunder Bay Press includes comprehensive guide books on topics such as fitness, gardening, and wellness.