If someone tells you that they charge $250 per fixture or that they can install 12 Lights for $2500 it might be a red flag. What that tells me is that they are not considering your specific job and are just trying to sell the maximum number of light fixtures. That may not always be the case but be sure to check fine print.
It still amazes me that outdoor lighting is generally the last thing that anyone thinks about when purchasing or building a home. That is probably the worst thing about being a lighting designer. We always seem to get called way after everything else is completed which makes the installation so much more difficult and expensive….