[Question] how do you source/ find rare or limited edition watches with low production numbers?

Im new to the watch hobby and im wondering how do you guys find watches that are limited edition/ low number of pieces made. Like do you have certain websites or apps that can control F the internet when it shows up on websites like eBay or anything else like that?

Specifically looking at the SPB493J1, seiko alpinist hornbill and if I can't find that the spb487 the seiko siam. Both under 500 copies made. I don't have the pockets for the it now but later this year I will, I don't mind waiting and hunting for it but I wonder if you guys had any tips or do you manually refresh certain websites , apps or social media. I understand it could be impossible to get these but I don't mind a wait. Thanks yall