Chris, although you may not believe in feeding reptiles to reptiles, it's what they do in nature. I had a pair of prasina's that would only eat live anoles, they have quite an appetite and are by the most expensive feeders I have ever had. It's quite a task getting vine snakes to switch over, it can be done, but with a ton of patience. Scenting is the best way to get them to do so. As far as trust worthy dealers go, any will tell you that they feed on mice (unless they are honest, but we know how that goes), so you're taking a 50-50 chance. I had a dealer tell me that the hognose he sold me was readily taking pinks, but would only take dead lizards. Luckily I had some anoles and day geckos in the freezer to get it started. Needless to say, I had a hell of a time getting it to take pinks, but it did, although it shouldn't have been that much of a task.
Good luck.