Prior to Generation 9, single-use held items used outside of Battle Facilities/Link Battles are consumed permanently. Rejuv is currently based on gen 8.
 
	The gen 9 mod for Rejuv has an option for whether you want to use Gen 8 or Gen 9's mechanics to this regard, and as Gen 9 content is officially coming in V14, this will likely be applied after the update as well, though may not be or come with a change in when certain consumable held items are first accessible for balancing.
 
	 
 
 
	That's Reborn. This was posted in the Rejuv part of the forum.
 
	Currently there are only 3 Focus Sashes obtainable in Rejuvenation (1 in Blacksteeple, 1 in Chapter 13, and 1 in the Karma Files.). 
 
	 
 
	Going off of what's in the Obsidia Department Store and Somniam Mall though, buying Focus Sashes should be possible in V14.