Target has the LEGO Dimensions Ghostbuster Story pack on sale for $24.99. There is an additional $10 off if you order online and select in store pickup. Use Red Card for an additional 5% off brining the total down to $14.24.
Current Amazon trade in value is $21.50. Amazon allows you to trade in a maximum of 2 of the same item within a 3 month period.
I bought 3, traded in 2 and basically kept the 3rd for free.