I believe that qualifies as a semi-generic response, as it addresses your original question to a minor degree, but also gives the basis for continued delay.
Just as another data point in this system, my engine has been in the air after "departed country of origin" for well over 100 hours now, but has yet to "arrived at destination country" and I suspect that it will continue same until the next production run is completed and distributed to the various selling outlets. BTW mine has also "arrive export exchange" four different times on three different days, before being "shipped by air", for the second time, over four days ago.
Meanwhile, prices have been going up on all sources, based no doubt on prices realized on eBay sales, so that the next run of these engines will likely "wholesale" to various distributors, if even supplied, at higher prices if/when they are completed and released, so the pricing that I may or may not have "grandfathered" in, may or may not be honored. If not honored, then the next excuse in line will be applied in as friendly a manner as translation allows.
Those who managed to get direct from Jin early on are the lucky ones indeed!!!
Clearly there were many different point source sellers who in fact had no inventory, but were selling this item anyway.
Just my $0.02 cents worth.