If you plan on playing the attention grabbing Atomic Heart on PC at a discount, you have only two options. You can get the game on PC/Ultimate Gamepass for Xbox/Windows. Your only other option at the moment, is to find a pre-order sale.
There are a number of storefronts/vendors that are offering such discounts. As mentioned here during an episode of NRO Podcast, we recommend using an official store. One such store we’ve had good experiences with is Fanatical. They are running a special that grants you 18% off the standard and deluxe edition. You can see the deal here .
Keep in mind two things. The first is this is a preorder. So you will not be sent the key until either the day you are allowed to pre-load or the date of release. Second thing is this deal will soon run out. So hurry up and catch it before too late!