Comparing Properties ? any advice ?

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Hey there just came across this deal and i usually have a broker to help me with comps but the thing is that she doesn't always have time to review my new leads but either way im thankful for it. Reason for this post is Major help for reviewing and whats the best way and where i can gather comps. I heard going to County tax appraisers is the most efficient way and its just how should i compare them, is there any webistes i can go to and buy the comps ? what helps you the best way and how do you compare ? 

Thanks for any replies and have a productive day :) 

-Kevin.