natchezjohn:
They are both. Each consigner (there will be dozens) establishes a shipping charge for each item they offer for sale. That's the issue. Each item will have a shipping charge established by the seller.
You can use the per unit shipping mod for this. It calculates like this: (from the admin)
The shipping cost will be used to determin shipping charges based on: Product Quantity * Units (products_weight) * Cost per Unit
SO, if you set the "cost per unit" to be 1, then in the products weight you enter the cost (say its $10 shipping for that specific item, they'd enter 10 in the weight box when adding the product), so if the customer bought 2, it would be 2 * 10 * 1. or $20. or if they ordered 1 it would be $10. Each product could have its own "weight" added when the product is added.