Don't sell it!
Man, dealers make me SO ANGRY! Six thousand dollars to replace the IMA battery is just pure insanity, even for a dealership! People need to realize that dealerships are very unscrupulous when it comes to their pricing. They essentially take the part's MSRP and tack on some arbitrary number, whatever the sales clerk is feeling like at the moment. That is pure profit for them, and the damn sales person gets a cut.

That's why every dealership you call will give you a different number. It's ridiculous.
The Insight is an amazing automobile, as you're well aware. I firmly believe that they will become collectors items one day, and Jay Leno agrees, so that's good enough for me.

If you're not aware, Jay is a huge car aficionado and collector.
Anyway.. I recommend you buy a BetterBattery. At ~$2000 shipped, it is a spectacular deal. It is just simply a better battery.

It's more robust, higher capacity and the performance increase is noticeable. We're also hoping that it will significantly outlast the OEM battery due to its overall robustness, but only time will tell. It has only been on the market for 4 months, but does carry a 2 year warranty.
I think we have knowledgeable people here in the Chicagoland area. Can we please get someone to volunteer to help her out?
I am sure you can find a shop that would be willing to do the work for you though. Though this seems to be somewhat of a problem based on another thread where someone is going through the same thing.
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Insight #1 - Silver '01 5MT @
158,388 as of 7/11 - Best Tank: 84.5MPG over 807mi

Insight #2 - Silver '01 5MT @
450,000 as of 1/12 - Best Tank: 86.0MPG over 800mi

Insight #3 - Silver '00 5MT, MIMA #163P, BCM Gauge, OBDIIC&C Gauge, BetterBattery @
228,869 as of 1/12 - Best Tank: 78.4mpg over 687mi