WTB: Anyone have a step-thru/mixte bike?

My wife recently expressed a desire to pick up a bike because she can't keep up on foot anymore with our 2 1/2 year old on his Specialized Hotwalk. I started looking at new stuff but ultimately we figured we should go the cheap route.

I'm currently eyeing up a step-thru Trek Mountain 800 of like maybe year 2000 vintage on Craigslist, for like $100. Anyone have anything like that?

Ideally would like to keep it under $250. 26" wheels ideal but would entertain the idea of 700c.

She's, um, 5'6-8"? Jeez I should know that. Somewhere in there.

Trek/Giant/Raliegh, that sort of thing