Is math.stackexchange a good place to ask where to find copies of books? Say I want to get my hands on a copy of Baby Rudin, would it be appropriate to ask on this website where one can found? I use this example because I know that there are free online copies of questionable legality, and if one does a quick check on Amazon a copy of this book will cost you at least \$40. However, I got bought the third edition for about \$9 by buying an Indian edition, which I was extremely happy to find as I am not a very big fan of pdf copies of books. Similarly, when I was buying a copy of Dummit and Foote, I saw that most copies were in the many hundreds of dollars, with there being new paperback copies being sold on Amazon for \$999 and used copies for as much as \$129. I do not recall exactly where I found mine, but I remember buying it online for under \$20. Again, it was a copy using cheaper paper (I believe an Indian edition) but the material is all there and it has held together excellently.
If I am trying to find a cheaper version of a math textbook, is this an appropriate place to ask where people have found theirs? If not, where can I do so?