We unfortunately stopped shipping our "complete" Classic Light Sets (the sets with bulbs and cords in one package) in C9 style, due to the frequency with which bulb breakages occurred in transit. You can buy them in person if you happen to find yourself at our Ogden, UT showroom, but otherwise we only ship them in C7 style from our website.
That said, we sell our C9-sized light strings and 25 packs of C9 bulbs separately, so you can achieve the same end effect as the complete light set, just without the fancy flip-top box, and some assembly required, as it were.
What you'd be looking for on our website is the E17 (C9) Classic Light String (in Two-Tone Green) and our C9 Classicolor 25 Count boxes of bulbs (in Classic Mix).