Right now (end-date unknown so do not wait!) at Amazon, when you purchase one of 17 Luxury Beauty Samples HERE (scroll down and you'll see the full list), you will receive a credit for the full purchase price of that item in your Amazon account after the item ships. So basically it's FREE. Plus, free shipping if you have Prime.
For example, if you buy THIS Jouer Lipgloss deluxe sample for $3, after it ships you'll receive a $3 credit in your Amazon account.
IMPORTANT: you can only use this credit on another purchase from the Amazon Luxury Beauty department HERE, and the item(s) you purchase with that credit MUST be sold and shipped by Amazon. But keep in mind that there are plenty of Luxury Beauty products sold/shipped by Amazon including products from LORAC, theBalm, Stila, etc.
Here are the details from the Amazon Luxury Beauty page:
Thanks again, Karen, for the hot tip!