I happened on a source of gum arabic that can be used in a pinch.
I don’t know what the price or quantity is for gum tracacanth or
arabic that is meant specifically for art/jewelry suppliers. Gums
arabic and tragacanth are widely used in the food industry. I
accidentally found vials of pure gum arabic flakes sold in
discount and craft stores as edible glitter or “cake sprinkles”.
The flakes are found with the cake decorating supplies and come in
several colors. I bought a bottle of the clear (no color added)
flakes and mix up small ammounts as needed. Cost- $2-$3 US dollars
for roughly a 50ml vial of flakes.