Hi urich,
Mainly because the old Airfix 737-200 is the only 1/144 game in town, and given it's undying popularity, demand keeps the kit prices high. It cleans up into a pretty nice 732 "Standard" version using only sandpaper and contour putty; here's one I did a couple years ago...
Ebay is still the best source for these, unless you can find one in somebody's stash they are parting out. Good luck! ![Smile [:)]](/emoticons/icon_smile.gif)
Take care,
Frank
http://FloatingMID.com
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http://GunsAGOGO.org