When placing an order, you will not be charged until your order actually ships.
Shipping can always be tricky to calculate on large orders. Some packages are larger than normal, some are heavier that usual. This makes it near impossible to calculate the actual shipping when the order is placed.
We make it a practice to only charge actual shipping plus a small amount of handling charge to cover packing supplies/boxes, etc. We do not view shipping as a "profit center" for our business.
When you place an order we will determine the least expensive way to ship to you by combining multiple items into single boxes and explore best way to get them to you. We use FedEx whenever possible as we get special pricing from them. We also use USPS Priority mail as often as possible to save boxing and use flat rate shipping if we can get a break on the weight.