The two side boosters and the center core were landed and will be reused.
This means that SpaceX will be able to reuse 92% of this Falcon Heavy launch. Only the roughly $7.5 million second stage will not be reused.
I think the rough costs of SpaceX Falcon Heavy components are
$30 million for each of the three first stage boosters. Actually slightly more for the center booster.
$7.5 million for the second stage
$6 million is the combined cost of the two fairing halves. These are the nose cone covers of the payload.
Reusing three engines and a fairing would be $96 million out of $103.5 million.