Few questions I have about buying clones.

Im interested in buying clones but I need to know what are some things to look for prior to buying them? I seen a few ads on craigslist about some sellers selling clones with mites and other issues so I would like to hear what should I look for or bring with me to make sure they are strong, healthy clones. This is for my first grow btw. Also Will the plants suffer from shock since its freezing outside?

Thanks

Bring a magnifieng glass with you and check the undersides of the leaves. Bring a cooler with you when you pick them up to protect them from the cold. Keep them isolated from other plants until you are sure they are pest free