I just bought a pre B (also an '84) in December and I love it. A little heavier than some nines, but shoots great and very reliable.
I have one factory and two aftermarket mags (K-Mag) - not sure where the previous owner bought these, but they work just as well as the original one.
Mine has a free drop mag well installed by the previous owner and the magazines drop down quickly for fast change. Was also upgraded with a new 16 lb Wolff recoil spring and Wolff extractor spring.
Depending on the type of holster and mag holder you are looking for there are lots available (Fobus and Kydex are probably the cheaper ones, but work). These companies also make mag holders. I found that most 9mm double stack mag holder for Glocks, etc. work for CZ mags as well.
The EE here is sometimes a good resource for holsters and mag holders, also frequent ebay and check out the dealers who advertise here. Armco always seems to have CZ parts available.
As always, I find the internet the best resource for finding information and extras like holsters, etc.