There is rare film, then there is Fortia. I have three propacks, 15 rolls total of Fortia 120. $140 a propack or $30 per roll. Shipping is $5 per order reguardless of how much you buy. PayPal only.
I bought it last year from a photog friend who needed some cash. I was told it was refrigerated prior to my purchase, I've had it in my freezer since. I have shot some of the 35mm stock, but it's horrible to use for shooting people, which is about the only thing I use color film for. I imagine it is absolutely beautiful for flowers.
Ultra 50 did have the craziest reds I've ever seen. I have a photograph of some red barns that's, well, loud. Not good for Caucasian people though as it made flesh tones go reddish.
It was only available in Japan, only made for a few years & was made in limited quantity. I bought some around 2005, forget what I paid but it wasn't cheap even then.