Cheaper via this deal https://www.hotukdeals.com/deals/lifetime-rosetta-stone-lifetime-vpn-something-else-3437420
Already posted 3 months free https://www.hotukdeals.com/deals/3-months-free-rosetta-stone-for-uk-children-3449506
There’s three months free for a selection of languages as part of their support for home schooling here : https://www.rosettastone.co.uk/lp/freeforkids/
I found it https://www.duolingo.com/ free
There was something on Martin Lewis Money Show the other day that gives free access to language tutorials at the moment. Cant find a link though. Might be helpful for your children or for you.