Tool for finding Median Sale Price of an Area?

[David Ramsey]

Hi BP! Super newb here looking for some help getting started. 

I'm looking for a 3/2, single family home for a live-in flip over 1-2 years. I've been preapproved already and have a ballpark budget. High level market research has been completed and I have narrowed to about 20 zip codes in my area, which is still a lot... 

Before diving any deeper, I'm hoping to swiftly reduce to 5 zip codes by eliminating the ones with median sales prices that would be too far from my budget. So far, I've really only had luck with Redfin's market insights to find median sale prices, but it's aggregating ALL single family homes. Can anyone recommend a tool that will find this AND let me narrow the selection to 3/2 single family homes specifically? (Free is a plus!)

PS - I realize that when narrowing by median sale prices, I should skew a little higher than my purchase budget since I'm looking for a fixer upper to renovate. I'm open to any and all advice on this, or any other considerations I may not be thinking of. 

Thanks everyone!

David