New Orchid Buying Protocol

[kiki-do]

Hi All!
I'm just curious as to what you all do when you buy new orchids. Do you isolate them for a while before adding them to the others you have? Do you repot them immediately even if in bloom? Do you spray them as an added safety measure? I would love to hear what everyone's routine is in regards to bringing in newbie plants, especially those with large quantities, greenhouses, etc.
I isolate mine for a few weeks, but I have to admit that lately, if they look really good, I don't really have my guard up about it, and I think that could spell disaster down the road. What's your routine and what pointers do you have for the rest of us?