What would be a good estimate for a remanufactured tranny from BMW & install from a local shop?

Anyone with thoughts about this?

My guy is saying, everything together will run about $3700. That seems a bit high, but I don't really know.

Does anyone think I should just not bother and sell the car. I've got about $4500 into the car (with original purchase and misc stuff.)

Also, I had a BMW dealer do a buyers check on it before I bought it, and that was just over a month ago. Any thoughts on that.

Thanks all.

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Miserable