
You will likely need to contact breeders before the litter is born. With what seems like the whole country wanting to get a puppy during lockdown demand has shot up so many ads will come down quickly if they even to up at all.
I would advise you search breeders for the breed your interested here and contact a few, if they have an affix Google it to see if they have a website (as for some reason the site no longer have links to breeders sites like it use to). Also contact the breed club they may have a breeders list of be able to suggest breeders to you.