How do you figure ARV without MLS Access?

[Cody Williams]

Hey BiggerPockets,
I've been researching for my first real estate investment and one thing I'm struggling with is figuring out the ARV on a home. I understand that you want to find the comps in the area and you want to take the average based on the closest proximity to your home and style. Is there a way to find out this information without MLS access? Are there websites/apps suggested for finding comps on a house?
I currently have a real estate agent, but I don't want to bother her for comps on every house I'm running an analysis on. Any suggestions on how to do this? 

Thanks!