Most likely the retail stores only have Tivo Premiere or Premiere 4/4XL and these will not work with satellite/DirecTV.
Series 2 (PLS, sold)
TiVo HD 1TB (157 HD Hrs, PLS, "652")
Roamio! Oh, wait, Its Juliet!
The TiVo Apocalypse begins on Sat 2013 Feb 16 00:00 GMT!