I have been unable to locate historical option prices so I'm having a hard time answering my question on my own. I have a few fairly liquid Nasdaq stocks that I swing trade on "significant" dips. Some will be down as much as 30-40% on a given day. So my question in a nutshell is, will buying calls on a stock that is down sharply be worthwhile or will volatility eat me alive? How can I calculate how much I'm paying for volatility throughout the day? I'm looking at current month ATMs. Thanks.