I just purchased a used Class D Audio amp, the CDA-254S for $160.
Class D Audio CDA-254S Kit - Class D Audio Kits - PRODUCTS

Its in a wooden case but I am going to put it in this chassis-

Par-Metal

I'm giving it to my son to pair with his Maverick tube DAC/Preamp and his PSB B6's.

I'll give a review after we have had it for a few days.