I couldn't find this at HD or Lowes anymore
Does anyone know where I can buy it?
Supply and demand probably. It's winter.
Where do you live?
Even though both are headquartered in the south, North Carolina and Georgia, it is winter and you do not stock "stuff" that is going to sit on the shelves. So since the majority of their stores this product would not move none can carry it, even though there are areas of the USA where people still grow plants.