Both stores have some in stock cabinets. I've seen two types—a basic white and an unfinished wood. The stock varies by store and time of year, but if a store is out of a particular piece you can usually order it and pick it up at the store.

Both also carry semi-custom cabinets, which allow you to get any sort of grouping that you want, just like kitchen cabinets. You can get a free design session to see what they have and how it would look and price out...

Home Depot has a number of Laundry Room Inspiration photos on its website. If you click on a title, it lists some of the items that went into creating the room, including the cabinet line.