The Taj was charging $20 to park last week as a result of the light show. They anticipated a huge crowd. Even Taj casino employees which are normally allowed to park on the property were told they could not use the garage for the period of the light show.
The parking is $4 at the Taj
To the best of my knowledge, EVERY casino in A/C now charges $4 to park. As mentioned a few such as Borgata and Sands absorb the fee if you are a premium player.