Vision Vapor can only be obtained through crafting. Sorry.
Though, looking up your city on ElvenStats, it seems you've been around for a while. If you still have
Red Panda Master floating around your inventory and can evolve it to lv 10, try deploying it. Its feed effect increases the VV return per craft by +3.
If this is about a city that hasn't appeared on ElvenStats yet, or I'm looking at the wrong player, the only other suggestion I can make is to do more Spire, or rush the research if you're not yet at chapter 3. The costs are steep (though in a good fellowship, higher chapter players might be willing to help with goods), but the prizes you get from it greatly help out the crafting scene. If you're already swimming in resources for building, the devs recently re-introduced Sip of Clarity as a third floor - third miniboss prize to help make cycling through craft recipes less costly.
I'd also suggest crafting and deploying the Moonstone Library set as soon as possible.