NEVER, EVER, EVER USE UPS TO SHIP LARGE PRODUCTS. We use UPS for day to day items, catalogs, etc. but would NEVER use UPS to ship product. Their prices are much too expensive for an item, such as a foam beam, or shape, column, etc.
You can find a trucking company that has shipments going in the same direction where you can put a partial shipment, or you can often find an empty truck returning to thier home, that will provide you with excellent pricing.