Rare ROM brooms and wands - help!

I have the same problem. My collector witch who visits Diagon Alley every day has bought eight of the ten wands from the shop there, but the missing two (Wand of the Forgotten, I believe, and the Elemental Wand) as well as the recolours of all the others are never in stock. I've tried duelling for them, but always lose, even against newcomers (yet another thing the developers should probably look into), and sent my pet familiars to look for magical artefacts, but all they ever bring back is a broom, and the same one every time. Speaking of brooms, I've also never seen the crystal broom in stock.