That said, the Internet Archive scans and preserves material for US$0.10/page, including storing it in one of their warehouses. 150 100-page magazines would be, uh, a US$1500 donation.
For that, you'd get ~300dpi scans (actually photographs) of each page, taken with a DSLR without damaging the magazine.
That's about the page count and what I donated to preserve the out-of-print works of Jan V. White: http://www.janvwhite.org
To get higher resolution scans, generally you either need even more expensive, larger format digital cameras (41MP gets you 8.5x11 at 600dpi), or multiple cameras stitching the photographs together, or to do destructive scanning, cutting the binding and feeding the pages through a high-resolution sheet-fed or flatbed scanner (don't do this).