The 2-bottle package is worth understanding on its own terms, including a specific labeling detail, before comparing it to the larger tiers.
This site lists the 2-bottle package simply as "$79" for a 30-day-supply-each package, without the clear per-bottle label the larger tiers carry — worth confirming the exact total for both bottles directly at checkout.
Since this site's own materials describe most people not judging results until three to four weeks in, a shorter supply on the smallest package may not give you the full evaluation window this site itself suggests you need.