This sale is for a module for a Hamilton changer to process $1 - $5 that costs $399.99. A $50.00 credit for trade in of original unit from changer so $349.99. Also, includes a refurbished Mars AE2481 validator that accepts $1 & $5 for $250.05. Customer is a technician and will take care of mounting and will not require support. The price for this module is discounted because it is installed by a technician that will not need support.