Indeed, the English website is out-of-date, but the changes over time in shipping rates don't seem to be too drastic. The full (76-page...) up-to-date price booklet can be found here; it's in Hebrew and valid for April 2021. The rates are:
Cost of a (cardboard) box at the post office: 9.20 NIS (small) - 12.40 NIS (large). IIRC, you don't have to pay this if ...
I recently purchased several from Dinic.
I've purchased from the same firm before for other adapters, so I have a small collection now, and they're all quite sturdy with excellent tolerances, and yes, grounded.
About 5€ each, before shipping; also on Amazon