I only use packages as a way to get a keyword up to page 3 - 4. After that you need to either build your own niche related mini pbn network specifically for that keyword and/or get some real guest posts on related websites. Recently I am noticing that after I throw a few of my own specifically-built pbn links from aged domains that are 100% relevant, the ranking will drop (sometimes dramatically) before bouncing around for awhile and then settling at a much higher position. This can take several weeks. If you haven't seen any movement after 8 weeks you aren't going to.
As for $12 being a low price for a pbn link @
don chino I think it is way over priced! Generic PBN types of packages simply cannot rank a decent keyword anymore so are only worth what they are worth - which is very little.
My advice is to throw some fairly cheap pbn links at the page using diverse anchors and then put in the work to get guest posts or build a handful of really good pbns yourself. You will see much more movement with much less links and you will have full control over those links as well for future algo changes. Just IMHO.