Thanks, but that's what I have already done , "upgrade to box" in cart. But for few games (Hannibal: Rome and Carthage in the Second Punic War, for instance), it seems that only digital version is on sale, the "upgrade to box" restore the normal price.
I'm Ok with this, not everything in the catalog has to be on sale, I have to adjust priorities on my games-to-buy-this-sale's list, and to consider buying the not-on-sale games at their regular price further later this year.
And I'm really fond of boxes , I even would like to be have boxes for DLC (just like the Pride of Nations') which never ever had boxed copies, I like a lot the artwork for their "box" displayed in their dedicated webpages, and would like to have the option to print it myself at least...
You might try to post a query to support. I also thought that the boxed version would still be on sale, though they might not discount the add-onn cost, ie, it might still add full cost of book and shipping.
Or as someone suggested. buy the digital on sale. and after that after you've bought the digital, you can upgrade to box.