Here are some quotations using this word, taken from http://dictionary.reference.com/wordoftheday/archive/2002/10/29.html:
Meanwhile, a poor copy was erected in the courtyard; many an unsuspecting traveler paid homage to that ersatz masterpiece.
–Edith Pearlman, “Girl and Marble Boy,” The Atlantic , December 29, 1999
All we can create in that way is an ersatz culture, the synthetic product of those factories we call variously universities, colleges or museums.
–Sir Herbert Read, The Philosophy of Modern Art
Then there was the sheaf of hostile letters larded with ersatz sympathy, strained sarcasm or pure spite.
–“Time for GAA to become a persuader,” Irish Times , Monday, April 13, 1998