Am I Overpaying for Botox?

The duration of Botox effects varies. You may want to wait until you first begin to notice the effects wearing off before returning for more Botox if you are concerned that your treatments do not appear to be long lasting. If you are satisfied with the results of the work of your plastic surgeon, I would advise you to stick with him.
For reference, you ought to keep a record of how many units of Botox are injected into each site during your visits.
Good luck.

Thanks for your question.
The best way to find out what you're paying and if it is fair, is to ask how many units you received in each area at the individual office visits. Then, find out what the price is per unit, compare it to what you paid, and then see if the 10% discount was included.
Generally, a forehead will take around 20 units, the 11 lines will take 20 units, and the crows feet will take around 12-24 units (average 18). The total average would be around 58 units, and if they charge $13 per unit, you would be looking at a total of $754.
That's fairly reasonable for Botox for 3 areas by an experienced and skilled physician.
As far as doing less Botox with future injections, some people (including myself) believe that doing Botox regularly will weaken or atrophy the muscle and lead to less Botox being needed, or, wider intervals between injections.
However, this effect is not proven or documented, so it can't be assumed that that really does apply or pertains to everyone.
I can just say that doing Botox will prevent your wrinkles, and as long as you continue to prevent them, you will not have to work as hard to get rid of them as those people who have long-standing, established wrinkles. In light of that fact, doing regular Botox regardless of the dose used has excellent benefits.
Hope this answers your question!