It doesn't have a 'sale' banner on it, it has 'new banner. So, 150 gems is the price; not a sale price. (and as Anniras says, it's possible it might be cheaper tomorrow, but maybe not, don't know....)
It's unusual for new items to be released for a low amount of gems though as Atlas. It only has a 2 day timer left, so it may not be available after this timer expires. Like all things though, I imagine it's possible for it to be re-released at some point in the future in a doorbuster or black Friday sale.