You can find some traffics provider services here in DP. There are suitable for most kind of niches, as they stated at least. However, I would recommend you not expect too much from this kind of buying traffics. Even most of them are targeted, but they are not a buyer motive prospect anyway. There are some better alternative ways. 1. Buy advertising banner on medical forums or websites. 2. Be a writer on medical related magazine online and build up yourself reputation.