I agree with Todd Z, Insure you are getting 100% Mercon LV ATF 4 combatible fluid, not a universal fluid. $195 sounds too high, and should not cost more than $150 at the most!
I would also recommend that the fluid be a brand name synthetic fluid and not some Shop branded fluid like Jiffy Lube, K-mart, etc.
I had my transmission flushed at a local Kwik-Lub shop and they used a 100% compatible synthetic from Pennzoil, and it worked great.
I disagree with Gavin, that you risk other problems by flushing. Actually you are at greater risk of fluid leaks when you drop the pan, and that only changes about 50% of the old contaminated fluid. A flush will replace about 98% of the old fluid, and since you do not have to drop the transmission pan, your risk for causing problems or leaks is ZERO!
Don't believe any crap from shops that claim to "Back Flush" the transmission. That is not possible and probably means their service is hyped for more profit....Walk, or run away from any shop that hypes their service with lies!
Another added note to a transmission flush: Do not let the shop put any cleaners or snake oil additives while doing the flush. Your transmission is designed to run on a fluid with specific manufacturer specs. Nothing else is needed and anything else added is just added profit for the shop, and may do more harm than good.