Integrating new hens - advice needed

Note sure!  If they have worms they might be passed on with them pooing on the same ground.  If they have mites they could be on feathers dropped. 

I have always got my pol hens from the same supplier and they are innoculated, wormed etc. so I buy in pairs and put straight in the coop at night. Then I leave them in late in the morning......11ish (don't worry.....it doesn't hurt them to go without food and water for a bit!) and they get to know each other.
They fight when they come out into the run because of food. Make sure there are plenty of pellet/water stations. I let mine out into the garden straight away because they don't fight so much in a large area. The new ones went to bed with the others on the first night although they had to wait at the bottom of the ladder until allowed in (So funny!).
Fighting isn't usually too bad although one of my uppity new girls had her comb badly pecked which meant lots of blood but it went black very quickly so there wasn't a pecking frenzy. You can always use purple spray for nasty pecks.
Of course there can be problems but you can deal with it quickly if you keep a watchful eye. It's just establishing the pecking order and although your heart is in your mouth worrying, they usually get on with it naturally and you have a cohesive happy flock in a couple of weeks.

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I suppose if you get a written guarantee from that supplier and your new hens are carrying some terrible disease she will be liable anyway.........
I presonally have no room to house separately and it does drag the process out.
However I do realise why the experts advise a quarrantine.....

You would have a good case to replace all the hens in this situation and NOT from that supplier. The supplier could be busted and would certainly need to treat their hens before selling more. We're talking INFECTIOUS disease here because we're assuming basic stuff like innoculations and parasites have been sorted.
All the suppliers I know have good facilities for quarantine and are vigilant in the care of their flocks bur you do of course get bad suppliers.
In this case we're talking about 3 hens and introducing 2 from a known supplier whereas with a large flock there could be a greater problem.
I'm not knocking quarantine....it just doesn't work for me......... or my hens