... I would search for reputable local distributors or resellers that provide warranties and simpler return policies in order to lower risk. I would carefully review the warranty details and think about paying more for better shipping protection if I had to place my order directly.
And I'd like to fly and spit diamonds... In short -- not going to happen because Bitmain, Canaan, MicroBt, et al only offer warranties to the original buyers - they do NOT have authorized resellers. Resellers can and should cover shipping damage but as for a miner that develops problems later on, you're on your own.