

scavenging sources have dried up completely
Last I looked — which was, admittedly, a few days ago — Google Shopping still has some retailers that have stock and haven’t yet jacked their price up. Mostly dinky little companies.
searches
Never heard of these guys, can’t vouch for their reputability, but they have 2x32GB of DDR5 for $159.99 listed as being in stock.
















I don’t believe — without looking at the protocol — that there’s a way to do so, unless you’re an admin on that user’s home instance.
It’s probably possible to find whether a given home instance has any users at all subscribed to your instance, since if that isn’t the case, it won’t be receiving posts to your community. But I don’t believe that home instances expose subscriptions.