https://www.universalcycles.com/sear...iser+handlebar
https://www.jensonusa.com/search?q=riser+handlebar
https://www.treefortbikes.com/search/riser%20handlebar
And many other places with just a google search:
riser handlebars swept back
Though perhaps you are having trouble finding the particular ones you want in stock. That's just the signs of the times since COVID disrupted the supply chains. But many were showing in stock that I looked at.