Hasbro's Black Series mini vehicles didn't really seem to do so well, but Mattel's Hot Wheels brand has continued to fair well at retail, it seems.
I've bought a few here and there, but really fell in love with the new Concept Series they are doing, in particular the TIE Fighter - I found two of these at my local Gamestop over the weekend:
They are awesome. So far, I've opened one of them. Such a cool little desk display for $4.99.