I do too! Thrift stores are also great sources of QUALITY books for pennies.
I found the leather-bound Harvard Classics for $2.95 a piece and the leather-bound Complete Works of Shakespeare for $10.95.
I also found Eisenhower's "Crusade in Europe" for a buck. It is the perfect compliment to my "Pictoral History of WWII", which actually started publishing volumes during the war.
I learned to find books in thrift stores from the late Fr. Pete, a German priest who worked at the library at Notre Dame, and would winter at our parish in Arizona.
Notre Dame (University)