I just bought mine last Saturday, too!!
You have to look for the "Vintage Racing Series" that is brown packaging not the standard blue Hot Wheels packages. Also the price is higher
; it cost $4.47 instead of the usual $1.00 at Walmart.
Finally, it is a "higher quality" than the standard Datsun 510 Hot Wheels. It has a metal body and metal chassis instead of the usual plastic chassis.
I made a late night run to Walmart to stock up on munchies for my trip to LasVegas (SEMA show!) and found that they had a new batch of the Vintage Racing Series BRE 510. I bought a few more (I admit I am a bit of a hoarder) so I could actually open one to play with. If you're buying just one to keep in the package, you should buy another: I discovered that not only are they metal body on metal chassis, they have real rubber tires too! But the BRE "paint job" decals scratch easily which is why you might want to keep one in the packaging...