Traxxas has cvds. Mip should have very something. They make great cvd for over ten years from what I've heard that whole time.
https://www.google.com/amp/s/www.miponline.com/MIP-Spline-CVD-Kit-Traxxas-T-Maxx-T-Maxx-3-3-08135%3famp=1
I too use ebay. 3 or 4 days across US usually. New York not included.
As for those parts, Jenny's actual site should be cheaper. Traxxas should have them on their site too but will be more for less..... as in more money less parts...