That sounds a little high. Just get the shocks from a local parts store, and do them your self. They are fairly easy to do. Just follow the instructions in the Projects section on changing shocks.
I went to the local sears store in Tyler, and was told thay they do not offer the monroe reflex shocks for a 2005 ST, I had them check for a 2002 or 2003 as they would be the same. They gave me the same answer. Welcome to East Texas, Duh!!