How much does square jaw Botox cost?

I am looking into cost-effective square jaw Botox.

I felt hesitant about getting a major procedure and didn't want to spend a lot of money, so I found a relatively simple option.

It seems there is quite a price difference for square jaw Botox depending on the clinic, so I am wondering if places that are too cheap are okay. When looking at prices for square jaw Botox, please let me know if I should simply compare promotional prices, or if I should also check the type and dosage of Botox.

Also, if this is my first time getting square jaw Botox, what dosage is typically used? I'm also curious if I can see results with a smaller dose if my jaw muscles aren't very developed.

For those of you who have received square jaw Botox, please let me know about your actual satisfaction and how long the effects lasted.