As Mike suggested, do it yourself with a turkey baster or a bulb siphon. I start with a quart of fresh fluid, remove as much fluid from the reservoir as possible and refill with fresh fluid, than run the engine for a few minutes. I repeat the process a few times until the quart is used up. Both of my Fords had noisy PS pumps and changing the fluid once a year kept the noise to a minimum.
Total cost, less than $5.