Ok, since you don't already have any, you won't have to quarantine them from any other's. So, I would suggest that if you can find any at point of lay that would be your best bet, unless you know that person that they would be coming from. Many people at this time of year are cutting back on the older hen's in the flock so they will have less to feed over fall and winter, but they might be about at the end of their laying of egg's day's. More people get those production breed's because they put out a lot of egg's at first, but they are not long term layer's and will stop laying egg's at about 2 or 2 1/2 year's of age. If you do not know the person that you would get the older one's from, you won't know if they are trying to pawn those older hen's off on you.