British pound is about $6, five-year note is about $8. Minimum price fluctuations are listed on the CME website. Click on whichever product then click Contract Specs. You also have the mini versions of Euro, Yen and grains. Mini dow is five bucks but don't let that fool you that's a fast moving market.
You must be a beginner, and the collective wisdom says beginners shouldn't trade futures, but if you do I think those markets I listed are more forgiving because of the smaller tick size.
Someday, and that day may never come, I'll call upon you to do a service for me.
PariahCarey provided some good initial guidance. There's stuff available which tick value is even smaller, i.e. the micro EUR/USD has a tick size of 1.25 USD, which is probably the smallest you will find (I may be wrong).
But you may want to consider the benefit of a lower risk versus the overall cost of transaction when adding fees as well.
Thanks for the replies. Barchart.com offer a comprehensive list of markets with their respective tick sizes. Yes, I agree that volatility has to be taken into account when one is pricing a market for possible future trading activity, and not just the tick size.