Ah, yeah, Vanda doesn’t exactly have a well stocked trading post so much as a ruined shrine, a rumor mill, and a petrified husband she will sell for 5 souls (or best offer, really). Maybe she’ll get some more in stock when you come back from your next quest, though! 😉
(Edit to add: That’s my way of saying the soul values for enemy drops were calculated based on the assumption they’re used mostly for leveling, split between a party of a few players, and if you happen to have any left over for shopping, that’s swell, but I didn’t count on merchants having reliable stock in what’s effectively a post-apocalyptic setting.)