Coolant work cost

[monto]

I dropped of the X5 after receiving a coolant low level warning and was told the following by the SA;

Here is the estimate as we discussed on the phone.

coolant bottle with new cap and transmission sensor, and lower hose on the coolant bottle replaced. estimate $765.00

This seems a little steep? Any comments in whether I should just do this myself of take to an Indy?

thanks,
monto