They make (and may still make) both the Flyer AND the Filter, I know they did up until 2006 when I bought them. The Filter was/is a ski that has the exact same footprint as the Flyer but is made with a different core.
Sports Authority most likely worked out the deal so that they could sell a lower priced Salomon twin tip to a wider base. When I was looking at skis back then I wrote Salomon and this is what they said,
"The Filter is a specially made ski for The Sports Authority:
Teneighty Filter # 785663:
110mm Tip width, 78-81mm waist
PU injected Core/ Monocoque Lite Construction
This ski has the same footprint as the FLYER, but with the PU injected core (foam cut to shape of ski) rather than the isocell complex core."