Okay, I figured it out. Isabel, a customizer of 1:6 scale dolls, needs a
mess work table filled with tools and creative projects. Scissors, wire snips, wire pincers, coils of wire, sandpaper, craft knife, craft saw, rotary tool, paint brushes, paint tubes, paint palette, paint stirrers, cup for rinsing brushes, glue gun, glue sticks, colored pencils — all of these are really easy to make from scratch.
She also needs, of course, dolls, in both finished and unpainted states. For finished background dolls, "G scale unpainted figures" on Ebay brings up a bulk lot of 28 plastic standing/sitting peoples who can easily be painted and parked on shelves. Now that I think about it, some of these peoples could also be strategically dismembered to generate heads, hands, clothes and shoes for parts bins.
For foreground dolls, i.e., those projects that serve as plot points, I would use some of the items previously discussed under the "dolls for dolls" tag: head sets and hand sets from Hornet Miniatures. There may be a generic or two from Bronze Age Miniatures for the inevitable naked doll[s] lying around, but one of those costs almost as much as a pack of 28 unpainted plastic peoples, so I’m not sure… Maybe the unpainted plastic peoples could be altered to be naked…
EDIT: thestylehome on Ebay has incredibly cheap lots of painted/unpainted plastic peoples!