You can add your own in rpg maker 2003. I chose to get RPG Maker VX though because I like to script my own battle systems and stuff. The preset stuff they give you in the rpg makers just wasn't for me as I couldn't make the game my own. Now with Ruby Scripting I can make literally everything however I want it. RPG Maker XP has ruby scripting too though, if you feel like making a full custom RPG and you don't have any money you could try finding a pirated version of that. Just know that you won't be able to release it to the mass public because it'd be illegal.
I found the official trailer for what I have on Youtube.
The battle system they show in that video wasn't for me so I created my own. If you have programming knowledge you can make it side view or however. I programmed a ring menu battle system for my game.
Look at this guy's game he made. This is showing the true potential of RPG Maker VX. He scripted it to have a party selection for each battle, more party members, and a side view battle system. Pretty neat huh?