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Via Groupon you can purchase discounted parking at Newark airport for $5/day. This is extremely cheap, although you can park at other parking garages nearby for $8/day. Wally Park (http://www.wallypark.com/w1/i1001322/) offers 24-hour shuttle service and they run every 5 to 10 minutes. They also have a frequent flyer loyalty program.
This Groupon deal expires February 19, 2014 and you can purchase 7 per account (and 2 additional as gifts). Each voucher is for 1 day parking, but you can combine up to 7 vouchers for up to 7 consecutive days of parking. Each day is based on 24 hours.
I personally like flying out of Newark better than JFK for the sole fact of cheaper airport parking. JFK and LaGuardia charge an arm and a leg.
Enjoy your discounted parking!