You are seeing the usual lag of something new coming out and fufillment. For example I ordered a 3900x from Bestbuy late on release day (or maybe the day after). Anyways they got enough in to send it to me last week. So whats going to happen is all those backorders from the first week are getting filled and each system will bring them closer and closer to being in stock. Probably by first week of August you can probably walk into Microcenters and pick one up.
I figured that. Just not sure how backed up the retailers were at this point. Its nice being in a place where Microcenters exist. I went years without it.

