Short and sweet. If you're looking for that last minute holiday gift this year, Amazon is offering a free game (Fallout 4) plus a $30 Amazon gift card on select Xbox One S bundles.
You'll have few options to choose from, the Xbox One S Gears 4 bundle which includes a 1TB hard drive for $299 or the Xbox One S Battlefield 1 / Xbox One S Minecraft bundle which includes a 500GB hard drive for $249.
I'd personally go with the higher storage option (plus it gives you a copy of the excellent co-op action game Gears 4) - but either are a great value.