The Foose amps have been discontinued for over 6 months now....maybe closer to 8 months.
Physically, they are fairly large. They came out before the "small" amp craze.
Sonically speaking, the KS amps are a 1/2 step above the Foose.
I don't think Arc Audio has any authorized on-line dealers, so I would be cautious when buying their product online....just my feeling on the matter. I also work at a brick-n-mortar store, so I says support your local brick-n-mortar stores...