See this:
That right there is internal frame rot. I guarantee you if you take an endoscope to the inside of that frame, you will see something far worse than the outside.. it's rotting from the inside out.
That transfer case is barely being held onto the frame. In order to fix this you'd at bare minimum need to cut those sections of the frame out and replace it with new pieces. However, in doing that, you're likely going to find even more rust in other places.
What I'm getting at is that this is a BIG project, and if you plan on keeping the vehicle for a long time, you shouldn't even consider this one. There's a reason they are asking $2500, period.
Yes, it's a lot harder to find a clean, rust free Jeep on the East Coast and the Rust Belt states. However, that doesn't mean they don't exist, you just have to look harder. There are people who take care of their vehicles who live in the rust belt states and perhaps have another vehicle they daily drive when there is salt on the roads, so that their Jeep doesn't have to take the abuse.
People can say I'm too critical with the rust, but having dealt with a complete rust bucket ('69 Camaro) before, I know that I'll never do it again. If I could do it over with that one, I would have just paid more and bought one with no rust at all.
Ask
@Ranger_b0b about this one, he's the "Rust Belt Heavyweight". If he could do it all over again and buy a Jeep knowing what he knows now, I'm betting money he would rather have just paid more and looked longer in order to find one with little to no rust. I could be wrong though... some people enjoy projects, and if you're the type who enjoys big projects, then a rusted out frame would certainly fit the bill.
I just don't like to see first time Wrangler owners (I'm assuming you'd be a first time Wrangler owner) waste their money, that's all. I'm trying to offer good advice.
I also second what
@Jerry Bransford said about looking for a 97-06 TJ model Wrangler. The 97-06 model is a much better ride than the earlier YJs (which is the one in this photo). The coil springs make a world of difference.