The 2-bottle package is worth understanding on its own terms before comparing it to the larger tiers.
The 2-bottle package is $79/bottle for a 60-day supply, totaling $158, with free shipping included per this site's own stated standard-on-every-package policy.
Since this site's own materials specifically recommend the larger packages for the gradual, long-term timeline it describes, a 60-day supply on the smallest package may not give you the full evaluation window this site itself suggests you need.