Instruct: Classify a review into positive or negative sentiment.
Query: Good books but "out-of-print"

Foundation of Solid Mechanics and the First Course of Continuum Mechanics by Professor Fung are listed as "unavailable" and "out-of-print". This is quite a bummer! Why are the publishers being so insensitive to the needs of the readers? The mentioned books are great reference books. Many of whom I've talked to said they would want to purchase their own copies instead of fighting over the books at the library. Get with it, publishers!