I bought my MIM Jazz for $200 - it was in excellent condition, hardly used. Kind of lucked out on that. I live in the Detroit area. On average, Fender MIM Jazz basses go for about $300-350 average where I am, but lately, there have been few below $300. Most are older, signs of use etc.
Some examples:-
This one is already sold but the posting is still up. I was choosing between this one and the one I got for $200 two weeks ago, I opted for the one that was a more recent model (2008)and hardly used.
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Currently there's a P-Bass for $225 also an older model, has a pretty bad chip on it, but still.....It's also a Black Label.
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On the Guitar Center website, there are a few MIM Jazz basses for around $249 $275- with $20 shipping, it still gets you under or around $300
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to the OP:
What is pretty important if you look through Craigslist ads, is to realize that some people do inadvertently refer to their basses as "Fender" when in actuality, it's a "Squier by Fender" and overprice their Squier basses based on Fender prices. lol. Read carefully, be vigilant, and you might find the deal that'll work for you.