Approximately how much should I expect to pay for square jaw Botox?

Perhaps due to my habit of unconsciously clenching my teeth or enjoying chewy foods, I feel like my jaw muscles are gradually developing. When I look in the mirror, the jawline below my ears looks thick, making my face look bigger overall, which causes me a lot of stress. I am considering taking a treatment program to reduce the volume of my jaw muscles in order to refine my facial contours.

However, since I need to set a rough budget before going for the procedure, I am curious about the typical price range for square jaw Botox. Is there a significant cost difference depending on whether I choose a domestic or imported product? I would also like to know the price difference between a single session and when considering regular touch-ups. If you have actually had a satisfactory experience receiving square jaw Botox at a reasonable price, please share the information regarding the procedure costs!