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Looks like this GoodwillFinds web-site started up back in 2022 during the Covid-19 stuff.
Still up-and-running and they have quite a few typewriter offerings.
It is simply a "just purchase" site...and not an auction-site like ShopGoodwill is.
I picked a heavy machine (Olympia SG3) and a small plastic portable to see what the shipping costs would be. They were $ 26 and $ 14, respectively. The shipping costs only show up when you start the buy-it process...but you can cancel the purchase if you do not like the shipping costs quoted.
Machines are sold as "un-tested" and sold "as-is". Only returns I can find is if shipping damage has occurred.
Might be a safe-bet if you are looking for a parts machine and their asking price is cheap.
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Checked in on this web site's offerings...and they have gone down from over 300 machines to barely 40 or so now offered.
Maybe Goodwill is letting this service wind-down...
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I've noticing some Goodwill stores (e.g. Seattle) moving from shopgoodwill.com to ebay. So, maybe each store is moving to find the site that most suits them. I've wondered if Fedex gives shopgoodwill.com a good deal, which may be good depending on where the Goodwill store is, and that this may be a factor. The Seattle store is very near USPS, UPS, and Fedex hubs, so they have more options.