A good realty website/company for Maryland?

Hi, I am looking at inexpensive houses around Rockville, MD. There are quite a few realty websites available, I wonder which one is better (better listing, design, etc) thank you!

www.realtor.com has 6,000,000,000 hits a day. why use anything else. it is updated every 24 hours, has all the properties listed in the multple listing services across the nation.

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