We certainly combine shipping on multiple orders.
All items in our shop are eligible for combined shipping discount. You should see the shipping cost of the first unit (say AA) and the additional shipping cost for additional unit (say BB) from the Postage and Packaging Table (Or, Shipping and Handling Table) in each listing. BB, which is lower than AA, includes the combined shipping discount. Usually, you can get this additional unit shipping discount automatically if you are purchasing multiple units from the same listing.
If you are purchasing different items, we usually charge you the sum of (the highest AA among your purchased items + sum of BB of each of the left items). However, you need to complete your purchase within 7 days. You can also send us a message and wait for us to revise the invoice for you before payment. If you are unsure about the calculations about combined shipping discount. Feel free to contact us before your purchase.
Free shipping items do not capable for combined shipping discount. However, we offer discount on the item price if you are going to purchase for 5 or more free shipping items. Please contact us before placing your bid.