This site lists six bottles at $49 each, $294 total, labeled Best Value and Biggest Savings, with free shipping.
Six 30 mL bottles, free shipping, the lowest per-bottle price and the 60-day guarantee. The site also recommends it as the best-value package in its habits list.
The savings come with the biggest upfront spend. Given the site's own 3-6 weeks expectation and a 60-day guarantee window, consider whether you want that much supply before you have tried it.