Ha! You are lucky if you ever even get one!!! He makes it in small batches and it sells out within minutes. I haven't ever gotten any and probably won't; I don't want to totally love a juice I can only get every once in awhile. I have enough cravings for other things... I don't want to add another. Cravings for analogs finally gone, tho.
Don at Backwoods Brew is working diligently to get RY4 available all the time. If you check the homepage of the website, he has announced a second and third round of RY4 will be available in the very near future. He hopes to have this flavor available more often, and is working hard with his flavor vendors to make this happen. So, if you missed out the last time it was available, you will have more chances soon enough.
As far as RY4 flavors, it is as simple as a tobacco base with vanilla and caramel. Now, what vapers expect that to be and what individual vendors sell as RY4 is completely up to personal interpretation. Some vapers want it sweet with a light tobacco flavor, whereas others expect heavy tobacco flavor. Some vendors try to stay true to the original idea, whereas others may add their own distinctive twist, such as a nutty or bakery flavor.