So it is just $132? Thats not terrible for 4 lines. If that works, stick with it I guess.
T-mobile could get you down to $100 for 4 lines, unlimited calls/texts, and 8 GB, but it would require different phones as few can hop between the different technologies of Verizon and T-Mobile. Maybe consider if you're getting new phones anyways.
Also, if you MUST have the high end new phone like the Galaxy 7, then a contract is less bad. But, you're paying a ridiculous price for a phone that really isn't much better than say a Moto X Pure (retail $399, you can probably find it cheaper). The savings from prepaid really kick into high gear if you realize that you're overpaying highly for the latest Samsung or Apple phone.