I don't think these are hard to find.I would grow White Rhino if I could find it myself. It's sort of a rare find. That and Purple Haze. So if I were you I would purchase and grow it cause of its rarity. Hope for the best man and I wish you luck.
I don't think these are hard to find.
Greenhouse ceeds, Nirvana, and White label all offer their own versions of White Rhino. So does Mr. Nice ceeds, though its version (which is probably the best one) is called "Medicine man".
Purple Haze ceeds are offered by White label, Positronics, and G13 labs. The Positronics one at least claims lineage to the older classic strain of the same name, so if that's what you're after, I'd try their version.