There is a dealerships in commerce under LSLV just north of Ls High school you can ask for directions icly and there is a dealership in rodeo just west of vinewood south of richman. You can access the dealership by typing /v buy and a list would pop out with a category of vehicle varying from saloons(4doors) to trucks to sports vehicle etc. But here's a list of vehicle prices viewtopic.php?f=63&t=348110&hilit=Vehicle+prices
- might be out of date but once you get to the dealership it will prompt you with all the vehicle prices as you open up the screen. You might have a vehicle currently spawned and the server requires you to park the vehicle before enhancing to buying the vehicle so it despawna and allows you to add a vehicle to your list.