How to Easily Create a Store/Item List

I'm trying to save myself a ton of manual work.

I have ~100 items and ~5000 store names/addresses. I need to create a list that has stores in one column, items in the next column, and each store/item combination listed in its own row. Example:

Row 1: Store 1 || Item 1

Row 2: Store 1 || Item 2

Row 3: Store 1 || Item 3

.....

Row X: Store 5000 || Item 100

Is there a way to do this in excel? Macro maybe?

Thank you in advance!!