Fable is very Zelda-like in how it plays. It probably won't cost you much more than a full-price game, but you could get a second-hand Gamecube, and a copy of Wind Waker (with Ocarina bonus disc), and you'll be a very happy man.
Or Jade Empire. That's the closest the Xbox has to another RPG in the same style. Most of the others listed are slightly more complex.