Outside the Tent
Snerp talks causally with the Vistani near the camp, he learns that the Vistani, generally, are silversmiths, coppersmiths, haberdashers, cooks, weavers, musicians, entertainers, storytellers, toolmakers, and horse traders. They also make good information gatherers and information sellers. They generally do not hold on to money, preferring to spend it on supporting their lavish and flamboyant lifestyle... and wine.
(I don't have a list of specific items each Vistani has on their person they are willing to sell. If you are looking for something specific, we can work out to see if one of them has it.)
While Snerp and Roberts are talking about procuring items, the Vistani around the campire fire are engaging in story telling, something about Strahd and a power Mage.
Inside the Tent
In response to Grahf's question Madam Eva stares hard at the dragonborn. She slowly looks down at the cards. Then back up at Grahf. Then down at the cards, the cards whose meaning she just described as leading to weapons effective against their foe. Then back up at Grahf.
I'm guessing you're the strong one, eh?