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ebay with a part number match, have a reputable shop (vendor TaninAuto is well regarded) rebuild your existing ECU, or a wrecking yard. You can use www.car-part.com to search multiple yards at once.
NO reporgramming required in '89-96 USDM cars. Just swap and go provided you're replacing like for like.
I don't think Tanin is a rebuilder for ecu's. That is a very highly specialized deal, and takes some specialized test equipment. Tanin just does the cap replacements as far as I know. A true rebuilder will test all aspects of the ecu
and will have back engineered the schematics. To find a reputable outfit go to a good well know auto parts store and ask who does the ecu rebuilds.