You can set a daily budget amount. Five bucks a month would only be 16 cents a day. You could bid that low for keywords that don't have much competition from other advertisers. But that is a very tight budget for getting your ad placed anywhere in the top 10 positions.
Lately, I've been trying to look for other CPC companies. Right now I am testing out http://www.searchfeed.com The prices per click can be a lot cheaper, but they have lower traffic numbers.
I have used adwords and it is effective but not as effective as I hoped. I only had a few click throughs per day even though my ads were appearing for hundreds of keywords in quite a high position on average.
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