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90-91 power mirrors are about $160-200 - each side (depending on how much they mark up) - at the GM parts counter. I'd try ebay or car-part.com for used first. Good luck!
i have them on my 90 suburban. i bought a replacment set off e-bay awhile back they look great. i still see them from time to time on e-bay. do a search there. good luck.