You could always build your own... Buy a foot of 1"X3" thick steel and the right size of rod (1/2" IIRC) for the little knob on top. cut the slab to the right length, drill a hole in the center for the dowel. Place it in and weld it solid. Leave some space in the bottom for the other dowel.
That's what i would do if i wanted it done now.
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