Looking for plastic window panes, custom size, with metal frames that
are held in place by magnetic strips (nonopening windows). Bought some
twenty years ago and don't know if they are still available (don't
recall where I got them).

http://www.windowsaver.com/magstorm.html

MagneticStorms windows are sheets of Plexiglas (or other acrylic
brand) held magnetically on the room side of your primary window to
seal out drafts, stop condensation, build an insulating air space, and
cut street noise.


http://www.planshouse.com/stories/Detailed/10202.shtml

Allied Windows Magnetic One Lite (MOL) storm windows are virtually
invisible and form a tight seal magnetic seal, reducing both noise and
drafts from historic windows.


http://www.magnetite.com/

MagnetiteŽ Windows are constructed of a light-weight and flexible
panel which seals magnetically and fits over the inside of your
existing windows.


Searched on: storm windows magnet