I have both GravityForms and Cart66.
At the beginning I wanted to run a simple shop only on Gravity Forms but this is not possible because there's no customer session or actual shopping cart to store individual results for each "product" form.
Therefore I tried Cart66 and tried to combine the two things. It's very sad though that Cart66 support for Gravity Forms leaves a lot to be desired, for example there's no possibility to let Gravity Forms handle product prices, there's no quantity tiered prices, and no Gravity Form is possible in the checkout form.
Is there any other cart that supports Gravity Forms to handle products?
Or even better, is there any way to let Gravity Forms run a simple cart?