i've heard that invisalign aren't very effective on adults and it takes longer than metal braces, and probably more expensive too. if you have minor misalignment, invisalign might be the way to go.

prepare to spend $2500-4000. insurances don't cover a dime for teeth alignment but the clinics usually offer payment plans - you pay some upfront and after that you pay a certain amount every month you visit your dentist. it'll be much cheaper if you become a subject/patient at a dental school but you'll be spending almost whole day every time you visit your dentist (more specifically, a student supervised by a dentist who may or may not be present during your every single visit).