Thanks to the "What's your favourite novel of all time?" by MrSmith I added:
The Pillars of the Earth - Ken Follett
House of Leaves - Mark Z. Danielewski
Stranger in a Strange Land - Robert A. Heinlein
On the Black Hill - Bruce Chatwin
Siddhartha - Hermann Hesse
The Big Clock (New York Review Books Classics) - Kenneth Fearing
Cannery Row - John Steinbeck
Gravity's Rainbow - Thomas Pynchon
Jarhead : A Marine's Chronicle of the Gulf War and Other Battles - Anthony Swofford
to:
Fortune's Formula: The Untold Story of the Scientific Betting System That Beat the Casinos and Wall Street - William Poundstone
To Your Scattered Bodies Go (Riverworld Saga, Book 1)
a bit more then $25, but what the hell it's winter.