When Harry was off getting his supplies for the school year, Bella and Sirius had slipped off to Knockturn Alley to get the three convicts new wands. There was a wand shop tucked into the darkest corner. More intricate and expensive than Olivanders. And a bonus was that the wandmaker did not remember every wand he ever sold. The wands work just as well if not better than their old ones and they’ve been getting used to them.