this is the best price I've seen anywhere! but you do have to account for shipping to see if it's still worth it vs. buying LFS. I have estimated $14-$18 for shipping. cheaper than PetSmart.
http://www.petsolutions.com/AquaClear-110-Power-Filter+I15510620+C1.aspx
http://www.petsolutions.com/AquaClear-110-Power-Filter+I15510620+C1.aspx