We've been experiencing the known issue wherein USPS charges are way too high. I believe that every time a customer adds an additional item to the cart, it's treated as having to go in a separate container. So, the more products being purchased the further exaggerated the shipping rates get.
Anyhow, the only fix I'm aware of is to upgrade to ShopSite V11. Contacted our host, Verio. They are not currently offering version 11.
This is a pretty serious issue, where a person ordering 5 paperback books is forced to pay $30 for USPS Priority Shipping. That cost should be around $6 or $8.
Does anyone know of another fix for this problem? Can anyone recommend a hosting service that's actually offering version 11?