you could go to the silverbowl track. its a public track so its free its kind of beat up and its really set up for nitro. its located in the sam boyd silverbowl sports complex near sam boyd stadium. im just getting out of nitro for a while so its ce for me.
as far as classes for ce mod and stock buggy are the most popular, stock truck is also good. 4wd seems to be dead which sucks that is my favorite