Works out to be cheaper than a 16 (~$6.75; $13.50) or 30 (~$10; $20) pack when they are at half price.
At ~28c each, this works out to be:
$4.54 (further saving of $2.21 vs pack of 16 at 1/2 price)
$8.50 (further saving of $1.5 vs a pack of 30 at 1/2 price)
I haven't check a WW store (yet), so if OzB community can check if WW is doing this deal in-store too, or just online only. I have personally noticed some WW deals even if it shows as online only, it is also the in-store price too, but that is anecdotal :)