Shadow Cat wrote...
Your best bet would keep adding items one at a time and checking postage cost, when you see the price of shipping quickly rise from (example) $25 up to $65 is when you know the parcel is too big / heavy for cheaper shipping options
Keeping in mind of preorders as Fakku wont split orders, order a few books currently released and another book that wont be released until Q3 2019, and you will be waiting a good few months for your books
Thanks for the info. So I should have one order with available books, and another separate one for books that aren't releases yet?