Your cheap travel options for getting to NYC by bus just got reduced due to a US Dept of Transportation crack down on dangerous operations.
Megabus and Bolt Bus are still operating and will likely up their frequency to deal with an increase in demand.
Is Greyhound really still an option?
Obviously, you might decide to travel on SEPTA using the more expensive and longer trip via the Trenton Line with a transfer on NJT.
It is much safer - and cheaper than Amtrak!