I'm in the market for a freestanding mirror and the prices are more than double or triple of the door-hung mirrors, even though they're not that much bigger. Does anyone know why?
Take Kmart's mirrors for example, the freestanding one is $60 while the door-hung one is only $25. The freestanding mirror is not that much bigger than the door-hung mirror, but the price has more than doubled.
https://www.kmart.co.nz/category/home-and-living/mirrors/
My guess is that the difference will come down to combination of glass thickness, backing material and/or framing for rigidity. Those wall mounted mirrors are extremely thin (3mm I think usually) and flimsy. Look at the specs and you'll see the $25 one weighs only 2.5kg(!), but when mounted to a wall or door strength doesn't matter.
A floor standing model needs to be much more robust, with a sturdy frame. The two top results at the link you provided weigh 12.6kg and 8.15kg - way more than the cheaper one.