supply-n; 3 Senses

Sense Number 1: an available quantity of a resource

Commentary: SUPPLY[+quantity][+amount][+available][+resource] an amount of something available for use
NOTE: the modifier specifies the resource, X supply, supply of X

Our supply of toothpaste is running low.
Get a free printer with your purchase - while supplies last! (quantity of available printers)
Some chemical has contaminated their water supply.
John probably has a lifetime supply of paper clips in his desk drawer.

PropBank: supply.01
WordNet 3.0 Sense Numbers: 1

Sense Number 2: act of providing a desired resource

Commentary: SUPPLY[+event][+activity][+providing][+resource][+desired] the activity of supplying or offering goods and services

This firm is engaged in the supply of raw materials to the steel industry.
Economists study the supply of, and demand for, goods and services in a society.
It's an argument from supply side economics.
The U.N. has criticized that nation for its supply of arms to terrorist organizations.

PropBank: supply.01
WordNet 3.0 Sense Numbers: 2

Sense Number 3: goods, provisions

Commentary: SUPPLY[+entity][+resource][+desired]
NOTE: often occurs in the plural.
NOTE: refers to stuff, not a quantity of something (see Sense 1)
NOTE: often does not have an accompanying modifier, as Sense 1 usually does

Our mini-fridge in the hotel room was stocked with supplies.
Each hiker will have to carry their own supplies on their back.
Do you need any supplies from the lumber store?

PropBank: NM
WordNet 3.0 Sense Numbers: 2