Add-on Ad Manager Add On Question


I wanted to see if anyone could recommend or have experience with a decent ad manager add-on that is free.

I don't mind spending money for developers who spend time doing it, but the only one out there that I came across was $39.95 and with my site being as small as it is, I doubt I would ever recover the initial cost.

That being said, if there is anything out there someone can recommend, I would appreciate it.