Is the cost of a melasma skin booster very expensive?

Because I spent a lot of time outdoors and walked around unprotected from UV rays, dark pigmentation eventually clumped up heavily around my cheekbones. When I went for a consultation to sign up for a 10-session toning package, the doctor strongly recommended using a melasma skin booster in conjunction with the laser treatment, explaining that my skin barrier was so thin and sensitive that using only the laser could actually darken the pigmentation. The principle of making the skin's environment healthy and firm to reduce melanin production is very intriguing, but

It is a bit of a burden because I exceed my budget to get the injections every time I go for toning. When doing a package like this, how much is a reasonable additional cost per session if I add the melasma skin booster? I think it will be painful enough to bring a tear to my eye, so I would feel cheated if I were being ripped off on the money as well. I am also curious if mixing in the melasma skin booster is definitely the surefire way to brighten my face compared to doing the treatments alone.