Talk to the Internet Archive. They don't just take internet stuff.
If you go to their web page that describes what they do and do not accept, don't go by that. It can be, and has been, wrong in the past including the recent past (this year).
Instead, try to get in touch with them by email. They might accept these as a donation.
You still have the problem of how to pay for the mailing. Just trying to get you one step closer to a solution.
There's no promise they will digitize it immediately, or even ever. But they might take it and then there will at least be a potential path to digitization.
If you go to their web page that describes what they do and do not accept, don't go by that. It can be, and has been, wrong in the past including the recent past (this year).
Instead, try to get in touch with them by email. They might accept these as a donation.
You still have the problem of how to pay for the mailing. Just trying to get you one step closer to a solution.
There's no promise they will digitize it immediately, or even ever. But they might take it and then there will at least be a potential path to digitization.