WeightWatchers is featuring the $10 a month promotion at the top of this page: join and get your first month free, then pay $10 a month for the next 10 months. This offer is a promo code that is best for new members who want a low fixed monthly rate for about a year and prefer a predictable outlay. Other active deals include 50% off selected programs, $5 a month for the first 3 months on selected plans, and a 72% discount on Core+ plans.
If you want the cheapest short trial (first 3 months), use the $5 a month for 3 months deal on the selected plans. That costs $5 per month for months 1 to 3, so you pay $15 total for three months. The $10 a month promo with the first month free will cost $0 in month 1 and $10 in months 2 and 3, so you pay $20 over the same period. In short, for months 1 to 3, the $5 a month deal saves you $5 versus the $10 a month promo, assuming you are eligible for the selected plans.
If you plan to stay on for roughly 11 months, the $10 a month promo at the top of the page is likely the better pick because you pay $0 in month 1 and $10 for the next 10 months, a total of $100 across 11 months. The $5 a month for 3 months only helps the first quarter, and after that you would move to regular pricing or another offer, so for a near year commitment the $10 a month promo gives steady low payments.
If your interest is in a specific paid program rather than a subscription month price, check the 50% off selected programs deal and the Save 72% on Core+ plans offer. The 50% off applies to selected programs and may be the best choice when the program you want is included. The 72% off Core+ is a very large reduction on Core+ plans and will beat the promo price when it applies to the specific Core+ plan you intend to buy; use that 72% discount for Core+ plan purchases that are eligible.
Newsletter signup is useful if you are a first time visitor and want future promos, but it is not the main offer here and does not replace the priced deals above.
When choosing, calculate the total you would pay under each applicable deal for the time you expect to subscribe. Pick the option that leaves the lower total. No terms on combining these offers are stated here, so plan on using only one offer at checkout.