The Cohiba siglo VI grand reserva is the most significant. The release started the trend of an increasing number of limited hard to find releases and increasing speculation in this segment of the market. When these came out, they sat on the shelves for 6 to 8 months despite universal praise. When they sold out the prices on the secondary market went through the roof in short order and people were clamoring for more. It seems like there’s a new special release out every month or so now, prices going up and up, with none seemingly available at less than 2x msrp.