I discovered something truly odd at Origin earlier....
I had been trying to buy some of the half-price stuff since Wed, but kept getting errors.
When I finally got into where I could update my Origin account info, it was showing something bizarre in the address, in the "Country" box.
It appeared to have an eastern European language in the box, with (near as I can tell) some other nation's term for the United States in the box.
Once I clicked on the box, changed it to the English spelling of United States, logged out, then logged back in (requiring me to select all the items again, as logging out cleared the cart). I could complete the purchase.