This Revell kit comes with the Sobelair decals as well, yes the one with the winglets. Revell has another 737-800 kit but without winglets, that one comes with KLM markings. Both are at 1/144 scale.
Yes, Airfix has a 737-200 at 1/144, the old release comes with Lufthansa decals but the newer release comes with BA
and Air France decals. You can convert it to a 737-100 just by removing two windows in front of the wing and two wondows behind the wing. I made a People Express 737-100 by doing this, yes that one is the resulf of surgery as well (I'm not a surgeon but I can do it
Minicraft has a 737-300 and 400 also a 1/144, the 300 kit comes with Continental decals and the 400 kit comes with US Airways decals. Masterkit also had a 737-300 at 1/144, it used to come with United decals, I made that one ten years ago, I still have it.
Hasegawa has a 737-400 at 1/200, it comes with the Virgin Express decals. I have it also. The Hasegawa kit has a bottom and a top fuselage half instead of a left and right half like on most kits.