I found six here in AZ; only need 5. I went through the website to order them there, and pick them up in the store. Hopefully they can find the units by the time I stop by this afternoon.
Home Depot will often have the items -- but will also be unable to find them in the store. They told me during a similar search 3 months ago that they have these enclosures listed as seasonal items, and therefore they get placed and stored at odd places throughout the store.
Their inventory may be correct, but they may not find them near the other worklights -- so have them look with the "seasonal" items is my suggestion.
Also, look for stores beyond your extended area. I found one store in San Antonio had about 64 of these items. The cost to have them shipped to me, or to a local store was prohibitive -- in the end I paid a little more and went with northern tools. BUT, you might be able to drive 90 minutes for another activity and find what you are looking for.