I purchased a number of mystery advents last year and thought I would share some of them since there aren't a lot of photos out there. LynB Designs has one that counts down to Halloween and that was one I bought for the first time. The price was $85 for 13 polishes, which comes to $6.54 per polish. Since it contains one shatter finish, which the brand normally sells for $12 with no discounts due to the expense of the base, if you subtract that off the price, the other polishes average for a little over $6, which is the brand's regular price during 50% off sales. For fun, I will not only review and describe the polishes, but also ask the question, would I buy this one if it were not in a mystery collection.