Recommended Ezine Advertising Sources: (I have not tried all of these but I have heard that they were responsive)
The secret to success is CONSISTANCY! Create a budget and stick to it. Plan to send 1-5 solo ads every week or every other week. Just remain consistent
These are recommended sources that I have compiled from trusted sources. This does not guarantee your results. Advertising is still about testing. Do 10, if 3 work ... great! Repeat those 3 and keep looking for more!
I highly recommend that you subscribe to The Directory of Ezines You only need the annual membership not the lifetime because you will know which ones work within a year.