"Talking of Diagon Alley," said Mr. Weasley, "looks like Ollivander's gone too."
"The wand-maker?" said Ginny, looking startled.
"That's the one. Shop's empty. No sign of a struggle. No one knows whether he left voluntarily or was kidnapped."
"But wands--what'll people do for wands?"
"They'll make do with other makers," said Lupin. "But Ollivander was the best, and if the other side have got him it's not so good for us."
Note above, from
Half-Blood Prince, that actually Ollivander's was closed from sometime in July 19
96 until after his rescue in early 1998.
There were other wand
vendors for sure in Diagon Alley, such as Jimmy Kiddell's Wonderful Wands and a few secondhand shops. For actual wand
makers, I'm sure there were a few hobbyists scattered throughout the UK and Europe, but as far as big-name manufacturers the nearest one to England would have been Gregorovitch Zauberstäbe (canon) in Germany just west of the Polish border, or Feine Klassische Zauberstäbe (non-canon) in Vienna, Austria.
I don't believe there is an "official" MH line on where students would get their wands, because it was all in what connexions your family had/has and how far you're willing to travel or how much you're willing to pay to get something close to Ollivander's quality.