Alright, I went digging into various sources. PP with the low rates is paying close to the bare minimum in terms of stipend.
https://www.aupairinamerica.com/fees/
Program Fees for 2021:
Au pair
Match fee - $450
Annual Program Fee - $9085
Minimum Weekly Stipend - $195.75
Educational allowance up to $500
Extraordinaire
Match fee - $450
Annual Program Fee - $10250
Minimum Weekly Stipend - $250
Educare
Match fee - $450
Annual Program Fee - $8220
Minimum Weekly Stipend - $146.81
Educational allowance up to $1000
*Department of State regulations specify that an au pair may not provide more than forty-five (45) hours of child care assistance per week in the Au Pair or Extraordinare Programs, or more than thirty (30) hours of child care assistance per week in the EduCare Program.
*Beyond private room and full board expenses, host families should remain mindful that the au pair becomes a member of the household. As such, the au pair is likely to have recurring personal needs that may include expenses for mobile phone, electronic devices and internet use, personal car use/automobile insurance and/or public transportation, toiletries, additional educational/cultural experiences, sports and recreation activities, as well as special clothing needed because of climate differences from their home country, or for sports, recreation or travel.
https://culturalcare.com/pricing/
$75 registration fee
$300 processing fee
$9195 program fee
*You will also pay a flight supplement fee of between $0-$400 for your au pair’s travel from their home airport to the gateway closest to your home.
Paid to your au pair:
$9983.25
*This calculation is based on a weekly stipend of at least $195.75 paid to your au pair for 51 weeks, including 2 weeks of paid vacation.
Additional costs:
Education requirement - up to $500 (requirement of 6 college credits during their term)
Room and board (Families often provide access to a car, cell phone, and include their au pair in family vacations.)
Insurance (If your au pair will drive, you’ll need to cover additional auto insurance, and in some states you may need workers’ compensation coverage.)
None of this takes into account the extras:
higher utilities
higher grocery bills
cell phone plan
insurance
car repairs
unexpected tickets - parking, speeding, etc.
clothing purchases for the au pair (if they don't have a good winter coat, for example)
taking them on vacation