I buy mine (a kilo) once a year in Split Croatia, I buy a few black truffles in Istria or Slovenia on the way home.
Cheats Truffle Omelet.
Place truffle in a plastic bag with your very fresh eggs seal and leave in the fridge for 24hrs, the eggs will absorb the truffle flavor.
Reconstitute your dried porchini, dice very small, make omelet and before you fold sprinkle with the porchini bits, plate and shave a little truffle on top, sprinkle with a little truffle oil.
A $20+ dish that costs a few $