I would use the words affordable or lower than usual rate but not cheap fun.
Will you pay his usual rate in the future or will the discount go on? I'm afraid you gave some folks on here ideas about how to proceed and take advantage of this times, it will up to the escorts to accept it.
The escort also made his choice and I'm sure it wasn't the first time he decided to violate social distancing while being nice and lowering his rate.
I had friends who bought the "all good here" in the 80's and 90's and they're no longer around.