Frank J. Wilstach, comp. A Dictionary of Similes. 1916.

Cheap

Cheap as dirt.
—Anonymous

Cheap as dog’s meat.
—Anonymous

As cheap as pearls are costly.
—Robert Browning

Cheap as sunshine.
—Thomas Hood

Cheap as the withered refuse of a blind-alley stall.
—James Ralfe

Cheap as lies.
—William Shakespeare

Cheap as stinking mackerel.
—William Shakespeare

Cheap as neck-beef.
—Jonathan Swift

Cheap as old clothes.
—Horace Walpole