Last summer when I was visiting Rome I went into a music store and saw a collection of books featuring double bass excerpts from italian operas. I didn't have any money with me, and I had to immediately after, but I was wondering if anyone here has seen these (or anything like them) and if so where I could find them? I haven't had much luck up till now. Thanks!

P.S.

I'm also interested in excerpt book from symphonic repertoire, but I've found those to be abundant; does anyone have any recomendations on good (and complete) ones? Thanks again.