The cheapest is probably the FI-7460, which is what E-Day has. I don't think he's actually ever used it to scan any oversized mags, which is a shame, but it IS A3 capable. Somebody send him some UK mags!
https://www.amazon.com/Fujitsu-PA03710-B055-Document-Scanner/dp/B01GY37TBY
And on the higher end you've got the FI-7700, which also includes a flatbed so you get the best of both worlds.
https://www.amazon.com/Fujitsu-PA03710-B055-Document-Scanner/dp/B01GY37TBY
Obviously both of these are out of most people's price ranges, which is why most of us use A4 scanners (which are fine for almost all USA/Japanese mags)