If you are in a residential area most suppliers won't deliver liquid oxygen to you. If your not using a medium to large torch, gtt Phantom, Mirrage or larger, on a daily basis then your tank will most likely exhaust pressure build up, which can be very loud.
Other than that a standard sized dewar is equal to approximately 16 K tanks, which is a cost savings in most cases.
It also has to be kept outside of any building and hard pipe lined into the shop building. At least that is the building and fire safety code in my area.
As to having them filled any larger welding gas supplier should be able to do it. If your supplier can't do it then ask them where they could have one filled.
Be sure you don't get one of those small medical dewars with low pressure output as they don't work for most torches and can be hard to get filled.
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