I just picked up one yesterday. The cost is $2k over LR AWD. You cannot spot it by looking online, you cannot order one online either. you need to call the store and ask them if they have one in their inventory. I was about to buy a LR AWD and called them 2 days ago, they have found one in their inventory and swapped me to it. I only paid $2k plus the tax difference.
The main reason with the stealth performance and the regular one is, it doesnt have the performance package so it just looks like any other model 3. They told me there is no hardware difference on the stealth one but they use the motors that perform the best in the factory for these models so the regular AWD cannot be unlocked as a performance in the feature. you need to get one built like this. The only visual difference is the red underline under the dual motor badge but it still can go to 60 in 3.2 sec just like the regular performance and has track mode. I think it is a better deal then performance.