In Harry Potter and the Half-Blood Prince, Ollivander is missing and his shop is closed.
In Harry Potter and the Deathly Hallows, Bellatrix gets a new wand (somehow) and:
Voldemort / Death Eaters have taken over Hogwarts
Since Ollivander's is closed, how are new first years entering Hogwarts acquiring wands? Book 7 does show some measure of wand legislation under the new regime.
Does the Ministry have possession of all of Ollivander's wands and only release one to first years/replacements after verification of blood status, or do the Death Eaters have them all or a cache of some (see the Bellatrix question linked above)?