I found Rejex through Skygeek.com. Number is 1-866-464-4368. 16 oz. bottle was $17.40 when I got it a year ago.
Zaino probably has a website for ordering too or a list of vendors.
I personally use Adam's line of car care products. They are easy to use, resonably priced, give a great shine, and maintain well. I hope this helps.