Where are the Blu Rays?

I have three Goodwills in my area I visit 2-3 times a week each looking for Blu Rays. I was doing pretty well until a week or two ago when the well dried up. The week before last I found two for the whole week, last week I found nothing, and it's only Tuesday but it's looking like maybe another rough week. Are they not getting donated? Are they being sent somewhere else? What's going on?