They are frequently on sale here, as they were hugely popular and a lot were sold. McCormack has offered a steady stream of upgrade options, so don't be surprised by varying asking prices. FYI, the input impedance varies quite a bit on various models. Generally the lower powered (though still relatively high powered) amps have a higher input impedance than the higher powered (very high power) amps. IMHO, one of the better values in audio, and a super match with Vandersteens.