The phrase "a source of supply" is correct and usable in written English.
It can be used when referring to a provider or origin of goods, materials, or resources.
Example: "The company has established a reliable source of supply for raw materials to ensure uninterrupted production."
Alternatives: "a supplier" or "a provider of resources".
"Accordingly, Biomedical was reliant on the funeral homes as a source of supply for his product," the documents say.
The "mountain" of sawdust could be used as a source of supply and its content distributed over the garden.
This shadowy industry — resourceful and effective, but also dangerous — serves as more than a source of supply.
You cannot wish away the need for credit, and restricting a source of supply (auto title pawns) does not eliminate consumer need for credit.
Other companies seek to dominate a source of supply, to patent a product, or to establish control over some other scarce resource.
He concluded that, because of the importance of transportation costs, producers tend to locate in areas where demand is high and a source of supply is convenient.
So in the revision, I had to criticize "A Nation at Risk" for failing to note the social and economic context in which children live and for treating the schools mainly as a source of supplying workers for global competition.
Invading Russia in 1708, he decided to first secure Ukraine as a source of supplies and manpower (promised by the Cossack hetman Ivan Stepanovich Mazepa, who had defected from Peter's side) and await reinforcements from the north.
The fleet sailed down the coast in close support, a source of supplies and a refuge for the wounded.
The eyes of the colonists therefore turned to the new United States, both as a source of supplies and an (illegal) outlet for their furs.
At a time when a sense of Canadian nationality was tenuous in the northwest, that region relied on the Red River Trails and its successor steamboat and rail lines as an outlet for its products and a source of supplies.
