I thought for sure the Invoice plugin was going to resolve this, but you still have to choose a shipping option.

Since I have multiple stores, if someone orders from certain shops, they can fully check out and pay including shipping.
If, however, they buy from more than one shop, they need to be invoiced to include a combined shipping.

I found a post that discusses changed Free Shipping! option and I did that, but it only lets you show that option OR a shipping option, it doesn't give you both to choose from.

How can I have them both showing for those that buy from multiple shops?

Thanks!