The beige one is also normally $146.99. The beige one is currently showing the sale price for the 30% off Women's Day sale along with some of the other Nob Essence items. When the sale ends later today, it will likely go back to the normal price.
The brown version is brand new and was not stocked when the sale began; therefore, it did not get the sale price. I may be wrong, but that's how I see it.