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The OP can get from EWR to Hoboken Terminal via NJ Transit Rail, without using the PATH train: Newark AirTrain to EWR rail station; NJ Transit train to Secaucus Junction; transfer at Secaucus for a Hoboken-bound train. One-way fare, including the airport rail station access fee, is $11.00. Travel times vary, but most trips take about 40 minutes ± from the time one boards the NJ Transit train, not from the time one boards the AirTrain monorail.
The cheapest trip would involve taking the NJ Transit #62 bus from EWR to Newark Penn Station, and then the PATH train to Hoboken Terminal, via a connection at Exchange Place. One-way fare: $3.10. Travel time probably about 50-60 minutes, from the time one boards the #62 bus.