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The RPG line are the books with the Pathfinder Roleplaying Game logo on their front covers, found here. They are considered evergreen products, which need to stay in print. Paizo also makes Campaign Setting and Player Companion lines, which have their own logos and are more tightly tied to Golarion. When a book on a particular topic is out of print, Paizo is more likely to release a new book on the subject than reprint an old one. Magnimar, City of Monuments is in the Campaign Setting line.
For the information you're looking for, have you looked at the downtime rules in Ultimate Campaign? They're not Magnimar-specific, but they give gp and labor costs for buildings and businesses. (Another perk of the RPG line is that their content is available free in the PRD.)