Ukraine is proving to be very resourceful!
Fast handling and safe packing are the rule. Secondary coshippable items will be combined in the box and on the invoice at around 90% less shipping per auction.
Combined shipping can probably be done by using the "Add To Cart" button,
then go to "Shopping cart" there will be a normal sized text link "Request total" above the column of item prices.
Ebay's changes in 2020 adding Google Pay & Apple Pay and others, added features while also messing up functions that worked perfectly well. Different software & hardware combinations have different paths and options.
The bottom of the next page has a button to "Commit to buy & submit request" which seems a lot like the old Request an Invoice.
If that doesn't work, please just buy both and then I will refund the secondary shipping. The latest changes may help international shipping costs. The system has difficulty combining things correctly because everything is so light weight to begin with.
Please see my other items for Carcassonne and mini expansions for other games.