In further discussion from your message, a car that has sat in weather with the windows open will probably not need as much of the electronics replaced as one that was literally submerged up to the windows. Having the water sit for months will cause more severe damage though. Some of the wiring may be damaged along with any electronics that got wet. The seat rails and lower parts of the seat may be rusting along with some of the components under the dash from extreme humidity. Get a good look at the interior before getting too excited about buying it. Without a parts car to pull the replacements from, it can be very expensive to replace what may be damaged.
The most likely and most expensive water damage is the central locking module (immobilizer box) under the driver's seat. Very expensive to get a dealership replacement, but there are services that can clone another box to replace it for a few hundred dollars. 'ECU Doctors' and some eBay vendors.
Even if you have experience or competent help, a car like this can become a deep money pit. I would not offer more for this than I could easily recover by abandoning it as a project and parting it out.
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I am not an attorney, mechanic, or member of the clergy. Following any advice given in my posts is done at your own peril.
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