I'm looking for a single word that describes a part or item being sold. The word should describe the individual items, not the product line, and should make no delineation between different products. It should just mean "an item which we sell, or is sold". Here's a simple example:
You work at a store that sells widgets. There are multiple product lines. You've got your standard widgets and your deluxe widgets. You have multiple stock of each product.
I want to say somethings like the following:
"Check that all the items to be sold are properly packaged"
"Each item to be sold must be tested before going on the shelf"
"Count how many deluxe items to be sold are in stock"
"Product" does not work as it describes the entire product line. "Part" is too vague, as it has too many other meanings, including the same as "product". "Stock" or "Stock item" does not work as it specifically means things which are in inventory.
Best Answer
Product is certainly preferable to item being sold, but have to be a little careful how we use it. This seems like a good working definition of the word:
You seem to be asking, how do you refer to a single element of such a set?
We observe product is a mass noun which refers to a set of things. Bars of soap and liters of water use units to identify a discrete part of the mass nouns soap and water. Similarly, unit of product could be used to identify a single item to be sold, although it sounds overly formal and almost academic.
Another option is to use notional agreement, a grammatical convention that allows a group noun to be used with a plural verb when the individuality of its parts is important. This type of construct sounds strange to me, but it is purportedly not as rare in British English.
Going by ear, the second example ("Each of the product must be tested") is almost certainly wrong, although a real plural noun would work ("Each of the widgets must be tested"). Either notionally plural nouns are more limited than syntactically plural nouns, or my American ears are balking at something technically acceptable.
Although I hope we all enjoyed this brief look into mass nouns, I suggest you use item or unit in those sentences, or, if applicable, identify the thing being packaged, shelved, or stocked more specifically.