The Commerce Kmart has them. They had 179 yesterday, and I bought 2. Though I didn't look at each box like
vwoom did (go to the head of the class, dude!), I did look at the dates on one stack of boxes, and they were a mixture of December 2008 and January 2009. $49.99.
5704 E. Whittier Blvd (cross street Gerhart), Commerce. (323) 724-2750. Walk to the back of the store, turn left and walk until you, uh, hit the wall (seems like the southeast corner of the store, but I frequently get confused about directions).
Also FYI, the 3rd/Fairfax Kmart (6310 W 3RD STREET) and the Vermont/Slauson store (5850 S VERMONT AVENUE) in L.A. had no boxes at all yesterday. I was pleased that the third store I called had them, so I didn't have to ride the lovely MTA all the way to Temple City.
I was also pleased not to have to pay sales tax nor to pay $10 more per box at Best Buy, nor, in fact, to have to give BB any business at all. Moreover, I found a dime in the parking lot.

As everyone has said, the clarity of the picture from the downloaded digital is something to behold. I'm still playing around with my rabbit ears -- one second I get no signal at all, and the next there's a sharply-defined picture.
Thank you,
vwoom and
delia.eve, for the info about the Temple City store.
I'm grinning as I type.