There is no buy-out program. That issue is dead, dead, dead as of 2009.
There is alot of property for sale all along the coast. For 39571/Pass Christian the prices on post Katrina vacant land are high and unrealistic. But the "Pass" is different in that for many, many property owners the property in 39571 was/is a 2nd or 3rd home & for many inheirited to begin with. So there is no real financial incentive to have to sell. Taxes on empty lots are low and even lower in the Harrison County parts of the "Pass", so it costs very little to keep the land.