Yeah, buying off those websites can be a crap shoot. It's so easy to bring in bad things with live birds that can cause long term grief.
If you do searches for a breed, say Silkie breeders. It should pull up private breeders. Their birds are more expensive but in general they are well cared for, healthy and meet closer to the breed standards.
But if they are to be lawn ornaments you really don't need to go to that expense.
You do need to be careful though so you don't create a problem having too many birds in the space. It seems huge now but it takes very little to tip the balance.