Adwords affordable alternatives

to very small business, what's out there?

[silverbytes]

I signed in ad words and I'm pretty happy. I like the fact the setup is cheap because my business is very small.
I think Yahoo program (don't remember the name) has a U$50 fee and Overture probably too.

So I wonder: what other reliable alternatives are out there, affordable?

Can you recommend some?

[shorebreak]

SearchFeed seems ok to me, not a lot of traffic but cost is very low.

[silverbytes]

Good, thanks! Any others?