if you want a molly disulphide dust. in australia a good item is PowerPlus graphite powder. it comes in a 35 gram plastic squeeze bottle.
Isn't that rather like saying, "if you want a drink of Champagne, buy a bottle of beer" ?
Graphite, IIRC, is a mined substance which is in the form of minute flakes which slide over each other It is excellent for locks, as there is no stickiness to attract dirt, absorb moisture or congeal.
AFAIK, Moly Disulphide is a synthetic product of the specialised chemical industry.
To the OP...."Any black Moly-grease?" is the question in a car-accessory-shop.
An alternative would be to use Copper-grease...this is ordinary Lithium grease ,mixed with lots of copper powder...the copper crushes into the surfaces in intimate contact and provides a low-friction surface which doesn't freeze solid with rust
Good engineers' merchants and heavy goods/ plant and equipment spares factors are another source of Ms2 (Moly) grease.