The Internet Archive has a tremendous collection of magazines across all disciplinary possibilities. Most are contained in The Magazine Rack. You can read them online, download them individually, or bulk download them using Jeff Kaplin’s instructions from 2012. Though, I have modified Kaplin’s wget command when files stopped downloading due to changes at archive.org, wget, or both:
wget -r -l 1 -nc -np -nH --cut-dirs=3 -A .cbz,.cbr,.pdf -e robots=off -l1 -i itemlist.txt -B https://archive.org/download/