Not sure if it is a sale or the regular price, but the
Signet Classics edition of Frank Norris' McTeague is listed on Amazon at $1.99.
"Frank Norris' graphic portrayal of the seamy side of survival in turn-of-the-century urban America remains shocking and powerful today -and its conclusion just as harrowing."
McTeague was famously adapted as Erich von Stroheim's eight hour movie
Greed.
The book is PD, but Signet Classics usually does a very nice job in their editions.