If making any tooling consider how you could make the part flat and wrap around during assembly. Flat parts are not that expensive, but as soon as you have something 3D with a lot of volume, the price increases quite a lot. Multi shot colors and details also add costs.
I’ve seen anything from a $600 mold for a small TPU shank up to a $8000 mold for a 3 color shot soccer outsole.
R