Nickel Town is the low-roller area of the current Riveria Hotel, Michael. You can still play penny slots there.

From their web site:

"Whether you consider yourself a "high roller" or a budget-minded vacationer, the Riviera Hotel and Casino has the right gaming experience just for you. From penny slots in the Riviera's 1950's themed Nickel Town, on up to the multi-dollar player's high-end gazebo, fun and excitement are yours for the taking."