Heater question

I have a small 2.5 gallon reef tank and my apartment cools down a lot. A heater is the logical choice. So far, the tank has stayed in the safe range never dipping below 74 degrees. However, last night it went much colder, i'm not sure how much colder, but I could tellit wasn't good. Any ideas for heaters with prices or even links for amazon or other fish places online.
 
Thank you very much. I ended purchasing the one from marine depot. Seemed to have good reviews and wasn't too expensive either. Thank you sir.
 
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