Nationally, most providers will charge anywhere between $10-16 per unit of Botox, with the national average being around $13 per unit. The price of Botox is contingent really on two factors: 1) the price per unit of Botox; and 2) the number of units required to achieve the look you want. Different areas of the face require varying amounts of units be used. For example, a simple forehead injection may require between 15-20 units of Botox, so your procedure can add up very quickly.
With all of that being said, there are two clinics in the greater Hattiesburg, Mississippi area that offer Botox: Hattiesburg Clinic and Pine Belt Dermatology & Skin Cancer Center. Both offer Botox injections at $12 a unit. So the short answer to "what does Botox cost in Hattiesburg" would be $12 a unit. Something to keep an eye out for is when either clinic hosts a special for Botox. Both providers do have reocurring specials. HC sells Botox at $10 a unit every 6 weeks, whereas Pine Belt Dermatology & Skin Cancer Center hosts a special every 8 weeks with the price of a unit of Botox being $9.
One last note on the price of Botox is that most providers, no matter where you go, will charge you a Botox/cosmetic consultation fee. It is important to ask the provider you visit whether or not that consultation fee will be attributed towards your Botox services (if you end up purchasing them post-consultation). It is usually not much, but will still lower the amount you spend on the injectable. Hope this answer helps!