How much would sheet music cost during the Romantic era of music in Europe?

I happen to have this book on my library-checkout-shelf right now! I'll cross post this here and in /r/classicalmusic.

By the 1800s there were some real efforts in cost-cutting, which more or less coincides with the information explosion happening around that time with books and newspapers. From a discount publisher in France in 1834, a "classic" work such as Mozart, Hayden, etc, i.e. something they could print and sell in bulk, cost 1 franc for 20 plates, or 1 sous per page. But as this is a Hot Discount Music price, you might mark that up 50%-60% for everyday pricing. The book also mentions not to take the list price on sheet music too seriously because people would negotiate over that!

The book doesn't otherwise mention any prices, and it doesn't seem to draw a distinction between types of music for cost, just how long it is and how many plates they'd need to make and how many copies they could hope to sell.

Prior to that your prices are going to be much higher, as not a lot of people bought sheet music. Some music that had little appeal to an amateur musician (such as opera scores) was rarely printed, and you would have it copied instead. For many large works there was often only one complete score ever made, the composer's which he would play harpsichord off of at the opera, and then a single-instrument part for each of the musicians, made by a copyist. Then the score was usually the property of the opera house that commissioned it. This is also why so many operas are lost except for "favorite arias" which sometimes got printed while the opera score itself moldered in some opera house basement until the building burned down. :/ Lost a bunch of operas that way.

I'll tag /u/erus as well and see if he knows.