Appraisal without paying

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Is there any way to get a rough Idea of what a house will appraise for without paying for an appraisal? If I think the home will appraise high enough, I will higher an appraiser. I just don't want to pay $300+ and then find out it doesn't appraise high enough. I'm looking at rehabbing a foreclosure.
I'm approved for 80% of appraised value. So if the home appraises for less, then that's money out of my pocket i have to use. Any help is appreciated....
Thanks for your time.