EXPE is one I'm watching. I'm looking at the 100 call calendar now - the mid is 0.30 and there is an unfilled bid at 0.35, which is not a good thing IMO as I don't like having to go more than a few cents away from the mid when buying & selling these low cost spreads. Based the charts in the weekly discussion thread I could see the mid getting to the 0.70-0.75 range, but with lower options volume I must feel confident that I can open and close near the mid before I open a significant number of spreads (and I'm not sure EXPE will behave like that). Note that the other lower cost spreads that show the potential for big gains the week of 4/27 (GPRO, TWTR, YELP, GILD) all have much higher options value so getting the prices near the mid is much more likely.