My wife and I were on prepaid but teamed up with her sis and brother in law and went for the $100 deal.
BIL had AAA which got us another 10% discount. After taxes etc, the monthly bill is $110.42 for 4 lines, $27.60 per line for unlimited everything.
For more details, here is the link
Note:Because we were on Tmobile prepaid before, for some reason, they charged us $12 each to provision new sim cards.
This is not a repost because I added details such as provisioning costs for sim cards, AAA discount and and accurate total monthly bill.