Retin-A 4

I used retin-a micro for my acne years ago and it worked like a charm, but since i stopped using it, it's slowly getting worse, it is now to the point where it's back x3.  It could've been the make up i was using, all i know is once i get more, i will not use make up anymore.  Does anyone know how much dermatologists costs for a visit and a prescription of retin-a micro without health insurance?  i'm desperate for a tube of retin-a micro.  i have real bad acne all over my face there isn't a spot where i don't have it (well, besides around the eyes and mouth)  It's very depressing and I don't know what to do.  I don't even have the money to do it, but I will come up with it if it is affordable.  thanks all