For pennies, OTCMarkets.com will show this. For stocks that trade on the majors, you can pull up financial sites from Google or Yahoo:
Finance.Yahoo.com or Finance.Google.com (they should show pennies as well but if not, go to OTCMarkets)
Also, your online brokerage provider should show this information as well. I prefer Google as it appears to have a much leaner and cleaner look for me.