Look for used boxes on eBay. Some sellers don't know the difference between factory bags and non-factory panniers, expecially Zega brand, which made factory panniers for BMW and KTM as well as Ducati. You can't use the factory bags on non-factory racks, but if you find non-ORM panniers they fit multiple racks in some cases. Don't forget to check the forum here too.
These are new and in the US, but may be a consideration for you.
TUSK $221 USD You might investigate Tusk near you.
Other brands to explore:
Hepco & Becker Xplorer
TraX ION
Givi Trekker Outback
Ex Military boxes can be adapted to work if you have the time and are willing to put in the effort.
Mermite box ECS Cases
Happy Trails makes solid racks too.
https://www.happy-trail.com/