Hey, Sassy!  First, thanks for the compliment on my new winter avatar...     It isn't that warm yet in NM, but it was too cute to resist!

And I just posted this on another thread but it answers this here --

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The repurchase form states:

"The company will repurchase products based on the prices in effect at the time of your most recent order or orders from the company, plus the sales taxes paid on the products being repurchased, less the company's cost of any prizes or product bonuses you were awarded based on the original purchase of products you are returning for repurchase, and less any money you owe mary kay inc."

So if you are thinking of returning inventory and have lots of discounted items, you may want to avoid purchasing anything else from the company!
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So you will get 90% of what the cost was at the time of your last purchase -- I am expecting to receive the full price back (well, 90%) on all my items as none were discounted at the time of my last purchase!  And if I don't, watch out scary kay!