They just did a price up a couple of months ago, eyeshadows went from 15 to $16 and they added about 50c to everything else, primer potion went from $14 to $15. I work at Sephora and I haven't heard anything about a price jump because it would definitely affect our stock and we've got plenty.
If the prices jumped that high, they'd be exceeding brands like NARS, Dior, and Vincent Longo. Not to knock UD, they're great and all but they don't hold a candle to some of those lines as far as quality of product. So they have no place raising prices like that. I doubt it's true.
May I ask where you got the information from?