Cost in the cheapest version (white nylon, usually referred to as WSF - white,strong,flexible here) is 1.50$ per cubic centimeter

(ignoring the discount for larger objects for now, as I have not checked if it would apply). Volume of your model is roughly:

(half the volume of a sphere of 10cm radius)-(half the volume of a sphere of 9.8cm radius)

assuming 2mm walls, volume of sphere is given by 4./3.*Pi * r^3

so no, it will not be exactly cheap...

Also note that the sintered plastic is porous, so probably not suitable to contain any pressurized fluid without considerable

post-processing. (If you look in the "blog" section of the site, there were some microscope images/videos of the material

posted sometime around october last year)

EDIT: If you mean mechanical pressure, building a rib structure instead of a solid shape (or a thin solid with thicker load-bearing ribs) should lead to a significant cost reduction.