After 5 years, the updated M4 is finally being imported and distributed among several dealers. Looks like the average going price is 2500 currently.
https://www.gunbroker.com/item/941540577
Bought an H2O with 7-round mag but they sent me the 5-round version. Just after I upgraded to 7-round tube, I saw a brand new, old-stock with factory 7-round mag.