Good luck, I snagged mine for $2900...not to brag. It's in remarkable shape and I haven't had to do any mechanical work(except an alignment which my dad did yesterday) since I bought it 2 weeks ago. Top is only 2 years old. 5 speed. Mmmm...not bragging no I'm not...maybe.
Before this one, earlier in the year(like June I think it was) I had my eye on a $800 '91 Silver 5 speed, needed a clutch, some work, a rear window, etc. Interior was in good shape though. Exterior had 2 spots of missing paint and 1 noticeable dent. It had been sitting for a while, in the grass, with flat tires. My parents wouldn't let me buy it and my dad refused to work on it if I did get it. So I waited and got the good deal, and my dad's pretty happy because he hasn't had to do anything to the car except a simple alignment.
So I'd say keep on looking and you'll find that gem of a Miata.