I'm trying to make a scale model of the solar system, hoping to go out and find some appropriate spheres but I'm curious if anyone has some good ideas about places/ways to get really small orbs of various diameters

With the sun I'll be using I'm looking for spheres with diameters in the range of 0.75mm - 22mm (basically 1/32" - 1") - any ideas?

(You are definitely allowed to make joke answers even though I put 'serious' in the title)