I'm selling 125x125 ad blocks on my site. It gets more than 450k visits and more than 1.2M pageviews each month with 75~80% visitors from the US, UK, and Germany. The site is related to music and lyrics. I'm starting cheap with just $50/month. With a special $300 for one year. The eCPM turns out to be only $0.04. If you are interested, then send me a PM. P.S: I can also accomodate a 468x60 banner if you need.