Doors and Windows - magnetic plexiglass storm windows?

Several years ago, for my screened in porch , I used plastic sheeting and covered home made wood frames to "winterize" my porch. but they look ugly and are a pain to install and remove every year. Modern Plastics (modernplastics.com)sells magnetic window trim in which you insert plexiglass and magnetically attach these to metal strips installed around the windows. Do these work? They want $2.00 per linear foot x 180 ft plus 200 sq ft of plexiglass at $2.00 per sq ft = $760.00 Is there a better cheaper way? I was thinking of buying inexpensive metal storm window trim and glueing magnetic strips to my existing wood window frames, but I can't find cheap metal storm window frames and cheap plexiglass anywhere. Any answers or comments?

Not familiar with the magnetic deals, but I'd shy away from plexiglass.......it will scratch, cloud over and generally look like crap in a few years.

I made some wood sash units to go in the holes of my screened opening on the porch until I got tired of taking them in and out and storing in the garage. Finally bit the bullet and installed permanent casement windows......now the "screen room" has become a year round second living room complete with gas heater.