Paid cash for part order and now do not want

On 3/1/2010 I leased a new car in NJ. $1000 deposit on credit card. I said I wanted a remote starter. That night when I picked the car up I paid my up front costs of the lease. A separate payment for the remote starter was made as the part had to be ordered. I paid cash. On 3/3/2010 (less than 48 hrs) I stopped by the dealer and told them I no longer wanted the starter as I was not planning to buy the car after the lease was up. (purchase price would be too much) I was told he would have to check with the manager. On 3/19/2010 when I picked up my registration I was told no as they could not cancel the order. It still has to be installed. If it came on the car I would only be paying a portion of its cost instead the whole amount.