Here are Enphase IQ6 microinverters for $70/each shipped, or $0.29/W
. These are being sold by the same vendor from which I had previously purchased M250-72s for $85/each shipped, or $0.34/W. This indicates to me that the selling price for the IQ-Series inverters may have now dropped below that of the M-Series inverters. (FWIW, the IQ6 has nearly the same power capability as the M250-72s (240W versus 250W), but it is only suitable for 60-cell PV modules.)
OTOH, I haven't seen any good pricing on the IQ cabling system. That's a bit confusing to me since it appears that the IQ cabling should be significantly
cheaper than Engage.