If you need big dose of CoQ10 - 1 X 400mg already cheaper , than 4 X 100mg (if you will consider similar bottle size)
But now it's discounted for 56% (original price was $25.49) . It.s cheaper then ongoing Vitacost BOHO promotion
(buy 1 item, and pay just half -price for 2nd), because you don't need to buy 2 pack for discounted price, and average discount for 2 pack just 25%. This promotion giving you 56% discount for 1 pack.
I never seen so good discount for strong Q10 before.
If you new Vitacost customer, you can use this link for registration http://goo.gl/jdWhRS and you will have $10 discount for first purchase of $30 or more (I will have $10 credit as well)
Their lowest shipping option is $9.99 DHL (heard varying stories about them) however.