Aside from "mining" the vendor, as in buying all stock of visible items to see what else appears... there's nothing you can do, and this is expensive a lot of the time.
Best bet is to find a local gnome to trade with who's running to the bank or can buy you some food/water with the copper/silver you've got ^^
(or try the Butcherblock druid ring, but likely that's the same scenario)
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