In my quest to find new advertising vehicles, I came across a few people suggesting to send solo ads to newletter subscribers via the publisher of the newsletter. I found a few out there that offer to send solo ads to the members, but the prices varie so much it makes you wonder what you get for your $. I saw a list with 700K members in my field (webmasters) that charges $2000 for a solo ad. I saw another similar list that chargers $300 for a solo ad to their members, sent twice! Big difference in price, roughly same number of members. Anyone has experience in this field? References? Thanks!