Just to clarify, the New York state spent casing requirement apply only to new pistols and revolvers received by a licensed dealer in firearms from a manufacturer on or after March 1, 2001, and does not apply to any pistol or revolver possessed by any licensed dealer in firearms prior to that date nor to any pistol or revolver legally possessed prior to that date by any person in this state. (provisions of Sections 400.00 or 265.20 of the New York State Penal Law).
As far as the New York state gun lock requirements, all new or used guns (long and pistols/revolvers) sold after November 1, 2000 must be sold with a gun lock.
There are several types of gun locking devices that are acceptable, such as cable locks and trigger locks. They don't have to be integral to the gun design (like the ILS). I know Kimber will send a gun lock out to a customer if they ask for one, free of charge (read their ads fine print).
When I bought my Wilson Combat, I had to have the dealer send the pistol to Wilson Combat to meet spent casing requirements. They did it without any problems. Also, my gun came with a free trigger lock.
Kimber probably has guns that don't have the spent casings so they restrict those guns from sale in NY or MD. It might cost them more to do that to all of their guns. I know that if a company sends a gun without the casing to a dealer, they may face penalties for non-compliance.
I'm fairly certain that Kimber does sell in New York, unless what I'm seeing are NOS (but I doubt it).
Hope this helps.