Last year I subscribed the CBOE end of day options data for all symbols. It costed $600 for a year. It was expensive compared to other data providers, but I picked them because they supposedly provided higher quality data. A few days ago, I received an email about updated subscription for the same data but at a much higher price of $2500, a whooping 300% increase. I don't know about its past price increase history, but this kind of price hike is just crazy.