I've been looking for Christmas presents. One which looked like a good deal was on Groupon here:

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I know a few women who might like this sort of thing. And it was reduced from £56.25 to £12.99, which is an apparent saving of 77%.

Knowing nothing about this sort of thing, I Googled the product, to see if it was any good.

And the supplier came up, here:

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It seems to be the same product. The ingredients match. But, surprisingly, the masks only cost 51p from the supplier, so £2.55 for five, before shipping. £2.55 to £56.25. Not a bad markup!