i LOVE my dermalogica moisturizer, however it is approx. $70 regular price and i just don't feel like spending that much on a moisturizer (originally got it for 40% off), no matter how amazing it may be. i found a seller on ebay with very positive feedback who is selling it for around $45. i've never bought skincare off of ebay and i'm a little afraid in case it's not what it says it is and i end up melting my face off or something. has anyone ever bought such a thing off of ebay? how do i know if it's legit?