ring my bell

I need to find someone on etsy that will make a pretty sign I can hang by our front door that reads, ”There may be a baby asleep in this house. So, if you are someone selling something, keep walking -- we are broke and you will be too if you ring the doorbell and wake up our baby.” 

I think I want it to say those exact words.

Does anyone know how much it would cost to get a trap door installed on our front porch?


Song: Half Asleep   Artist: School of Seven Bells