I've just come across this included on an eBay listing. If you've not seen it before the use of Cherry Blossom Waxed Leather Oil 100ml (a product I had never come across before) may may be worth considering as a slightly cheaper alternative to using Leder Gris Xtreme.
The best price that I could find (including delivery) is £4.98
https://www.ebay.co.uk/itm/Cherry-Blossom-Waxed-Leather-Oil-100ml/152836834522 or £3.99 collected from John Lewis if you've got a local store.
