What's the best study material now for the ARDMS vascular exam?

I'm registered in the abdomen specialty and am looking to take the vascular exam next to eventually obtain my registry in that also. I'm going to purchase some study material and just wanted to get opinions on what would be the best to purchase and where to purchase it. Edelman was great for the abdomen as well as the physics so I'm thinking to go that route again for the vascular but wanted to be sure before spending the money. Thanks!!