$184 is a good price for all windows (excluding front windshield). If $184 is for only the rears and no front windows, forget it..
They don't ask you window tint cause they only carry 4 kinds (if I'm not mistaken)
5%, 20%, 35%, and 50%.
This is how the place I went to get my car tinted had it set up
I would call to confirm, just say "that $184 is for all windows right?" and let that be that.