If possible try to deal with a shipping company selling their own containers and avoid the "dealers,brokers and middlemen" also you want to buy an A Grade container which can still be used on the ocean as opposed to a B Grade container which can no longer be used on the ocean and is another way...
I was considering a shed for my overflow of "stuff" that I seem to accumulate and I was able to convince my wife into allowing me to get a cargo container to put next to the 'barn" she let me put up about 8 years ago. So I set about finding one and after a lot of emailed quotes who all wanted...