I'm inquiring because the price of fillers varies greatly from hospital to hospital.

I'm looking into fillers these days because of my forehead lines, but the prices for fillers vary quite a bit from hospital to hospital.
Even though it's the same brand, the price of filler varies so I'm not sure what the standard is.

If you get advice, some places say that 1cc is enough.
It's confusing because other places say you need to add more than 1.5cc to make it natural.
I understand that the price of filler goes up as the amount increases, but I'm worried that if I put too much in the arm area, it will look awkward.

The maintenance period description also differs from hospital to hospital.
Some places say they go for over a year.
Some places also say that you need to retouch every six months or so.
I wonder if this difference is directly reflected in the filler price.