CECBs are hard to find here lately (western Detroit suburbs). I was shopping for an unrelated electronic gadget a couple of days ago which caused me to make the rounds. I made a point of looking to see what CECBs were still on the shelves. None of the stores I was in had any (Target, Meijer, Kmart, Walmart, Sears).
About a month ago, I was looking for another Zenith unit. My local Kmart had just one, an open-box unit that was $10 off list. The only thing missing was the remote battery and the unit looked OK, so I grabbed it. (It works just fine, not sure why it was returned.) Good thing too, since I haven't seen any others anywhere since.