I'm not wasting any time here. My pal @targetfanatic just informed me that you can get this limited edition Sonia Kashuk 10-Piece Brush Set for ONE DOLLAR by clicking through the link in her Instagram bio HERE. I just checked and apparently this WAS available for purchase online, but now you can only access a list of stores in your area that have this set in stock. But if you find a store that has it, the price MAY be $1 not all stores have the same pricing on clearance items so it's important that you ask). So call your store (if the Target site says it's in-stock there) and hopefully they can tell you more (and possibly hold a set for you until you can get it).
Thanks so much, @targetfanatic, for the awesome tip!