Here is where you can purchase Marlin Industries Products:
https://www.ifixit.com/Store/Tools/Marlin-Magnifying-Spectacles/IF145-248-1
https://www.ifixit.com/Store/Tools/Marlin-Magnifier-Lens/IF145-246-3
https://www.delasco.com/pcat/3/Self-Help_Products/MG-5P/MG-5P/
https://www.debspecs.com/dr-hirsch-s-magnifying-spectacles-5-with-soft-case.html
https://www.ifixit.com/Store/Tools/Penlight-Magnifier/IF145-386-1