Model shops, check lots of model shops. That's another way that you will find this kit. Also the help of other modellers like gendarme here will help you get one into your hands.
Lot's of good stuff at Borden, including a Panther, Hetzer (being restored), Wirblewind, Sherman Crab Flail and much, much, more.
By the way, I just noticed these were your first 2 posts. Welcome to FSM.
Happy Modelling and God Bless
Robert