richmondcontrols.com and click "FRED Flasher" on the left menu. (or go to richmondcontrols.com/fred.htm, but you have to be on the main page to get the order info, I believe.)
This guy is challenging to work with, but he has the best product available and offers a Z version. I do not have the Z version but have a few of his circuits in a kit with an N-scale EOT from another mfg...maybe it was NJIntl? I was thinking of using those for Z, possibly modifying them. But, he is advertising a Z version now so I'm interested in that.
The thing I like about his products are: (1) they have a more prototypical (slower) flash rate that just about anything else I've ever seen. (2) can be track powered, and more importantly are compatible with DCC power right out of the box. The N versions I have work beautifully.
Great products, but he has a very much "soup dictator" persona for you Seinfeld fans. You need to sort of "butter him up" if you want to buy something from him. Maybe just placing the order on the website is the way to go. I've always just seen him at shows.
