How much should a power steering flush cost?

Shop around, shouldn't be more than $100

Is there a current issue with the steering? I just repaired a 2003 Hyundai Elantra power steering issue. They said they wanted a flush because the power steering was making 'a grinding noise'. I showed them the fluid level was low because the high pressure line was leaking steering fluid. Be sure of the issue before having anything done. If there is not an issue, can't see reason for a flush.....

What color is the fluid.. Clean and clear? ... Black and contaminated??