The Collagen Cushion Compact Foundation Refill is good value @ $27 (you don't need to purchase the compact, the refill lid seals the foundation anyway). I normally stock up on a couple when they are 50% off.
Another nice product is the Thermal Hair Wrap @ $11 it's worth grabbing.
Over the years I've tried a few of their products, I wouldn't buy any of it at full price (except maybe the foundation).
Beware: Mirenesse will send you heaps of spam.
Shipping is $10, free $69+ spend.