Researched it a lot over the years but never had anything major done. Prices below are based on where I live (USA).
Jaws are a few thousand dollars. Not that expensive by plastic surgery standards because it's a pretty easy procedure to do. Surgical rhinoplasty is expensive as fuck. Talking $15K once you include the hospital bill, anesthesia, etc. Liquid rhinoplasty is $1-2K (depending on the MD and how many vials of 'filler' you need). Most, but not all, of the 'filler' gets absorbed within a year or so, but if you're looking for a relatively non-expensive quick fix for minor problems, it's an option.
Whether or not you'll actually get anything out of looksmaxxing depends on a few things, including age and how close you are to normie tier naturally.