I think they are a discontinued ID-only line and you will not find them, new, in shops. Try AV123.
Used to be a UK company (Onix Electronic Co., Ltd). MLS Imports was their US distributor based in Colorado... MLS runs AV123.com today and sells as well as makes these now. AFAIK nothing recent has to do with the original UK based company which had partial and then full "far eastern" ownership by 1996. It's obviously a very complicated path, but suffice it to say you won't find them new in NYC. Perhaps used? The current Onix line is available from AV123.com only... or used.