Hi,
For an eCom site powered by WooCommerce I have the gravity add-on and GF.
What I'm stuck with is this:
We have variable products [size, color] and need to add customization options where there's a fixed setup fee plus a cost per unit ordered. Other upgrade option is without setup fee only a per unit fee.
Please contact me: eileen.k2 [at] gmail [dot] com
Thanks