(CNN) - Walmart's new car seat recycling program was so successful, the event is ending early.   The company was offering a $30 gift card to anyone who brought in an old car seat as part of a recycling effort with TerraCycle to keep plastic out of landfills.   The event started Sept. 16 and was supposed to end Sept. 30, but the store ended the program after nearly 1 million car seats were collected, according to a statement it made to USA Today.   It also said that’s the equivalent of diverting 200 million plastic bottles from landfills.