Depends on supply and demand.
If it is a state/country with easy legal availability, the price is less than gunshow price (equivalent of used trade-in value).
If it is someplace with highly restricted access, it is a premium. I do know that in Haiti post earthquake guns were going for roughly double MSRP. Glocks were a grand, AR's were two.
Just like drugs, alcohol, tobacco, and every other .gov regulated item.