For outdoor use you are going to have to DIY. IIWY, I would use treated lumber...6"x6" for the vertical post and 2"x10" piece for the bottom and 1"x 6" for the top. Place some stick on rubber feet on the bottom board so it has air movement between it and what ever it is sitting on. These should be very stable and if you want you can even stain or paint them. Another choice is to just use some solid concrete blocks glued together...also paintable.
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