I think they should be in a shop, but not a proper wand shop, but a rather arcane shop in general, where you could also obtain, say, scale mails, platemails etc for use with alchemy.
In addition, I think it would be great if you didn't have to pay with money, but items, a random selection of basic stuff, which the owner demands, like 10 rubies, 2 mountain stones and a figurine for a good wand, and 20 tree seeds for a basic one... just an ides
