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