How much does a collagen booster cost?

I have received many recommendations for collagen boosters and am considering the procedure. What is the approximate price range?

I was honestly very inclined to try collagen boosters because of the claim that they look natural, unlike artificial fillers. However, since it is a somewhat expensive procedure, I have some questions regarding actual effectiveness and cost before booking a clinic, so I am writing this post to ask for advice.
For those of you who have tried the collagen booster, how effective are the results you actually feel, and how satisfied are you?
I heard that collagen boosters don't make you plump up immediately after injection, but rather work on the principle of gradually generating collagen.
I am wondering if I can actually feel noticeable improvements in skin density or elasticity starting about a few weeks after the procedure.
I am curious to hear honest reviews from those who have already received the treatment, specifically regarding whether they saw noticeable effects on fine lines or pore reduction in the butterfly zone, or if the changes were merely minor, such as a slight improvement in complexion.
I would also like to know if the satisfaction level is high when receiving injections to add volume to slightly sunken areas, such as the cheeks or nasolabial folds, as they naturally fill out.
Cost is also a factor that cannot be ignored, so I would like to know the approximate appropriate price range and a reasonable treatment cycle.
I would like to know how many cc I usually need to get per session to see results on my entire face or problem areas, and roughly what is a reasonable standard to expect per session to avoid being ripped off.
I heard that to see proper collagen booster effects and maintain them long-term, you need to receive at least 3 sessions at one-month intervals. Approximately how much does it cost to sign up for a 3-session package?