Hello, FinViz has a free screener that allows screening of stocks using multiple parameters (relative volume is one of them). The quotes are delayed by 15 min for the free version - I think. Please feel free to check it out.
Scan for stocks with price between $ 1 and $ 20 (Could be any price range of your choice. I currently use the specified range)
Scan on a daily basis (EOD) which stocks have high relative volume and stocks with a current volume of at least 500K or more ( 1M or more is better)
Wait for a pull back...