I had the same problem for a long time. There are no specific dates that they restock that I know of but how I got mine was because of an app called "Hot Stock". Basically what you do is you can choose a specific product and what it does is whenever that item gets back in stock it alerts you. You have to be very quick because they go away in a matter of 5 minutes. You can search up a video about it if my instructions were not clear. Hope this helped!