discountvapers sells the bases and cigtech sells the tops at $1.96 for the base and $3.99 for the top. They are not in stock at the moment but when they get back it stock it is the cheapest genuine protank money can buy.
I was shocked when I founnd out they had the tops for only $4. Wonder if they will restock at that price, like you said makes no sense to buy the full protank.
