I do offer combined shipping, it is auto calculated for domestic buyers, just add everything to your cart and it will be corrected for you. Please keep in mind that shipping has gone up and same with the cost of supplies. I will do my best to get you the cheapest price possible, but if you are buying multiple items, it could go up quite a bit for international buyers. I've entered the basic dimensions for international shipping, if it doesn't look right or too cheap, let me know and I will get it figured out for you.