Ii'm looking to sell some ICE i took out of a car i sold, but i've got no idea what its worth 2nd hand or even if its any good

its a Alpine MRP-450 amp

&

a 900W 12" alpine sub in a carpeted box

all in working order and i have all the cables etc to fit, what's it worth gents? no idea how old it is

The amp is this one http://www.crutchfield.com/S-u6tYeZC...-MRP-M450.html

The sub is this one http://www.crutchfield.com/S-LZASEqA...SWS-1242D.html