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A set of injectors will run you from about $200 (re-manuf) to about $300+ for a new set. You can change them out yourself (depending upon you having some basic tools and mechanical knowledge) and save the labor cost. You will need some plenum gaskets and new "O" rings for the fuel tubes and injectors. The gaskets and O rings will be somewhere in the $30 to $40 range.
If these prices seem steep to you, get a quote from a dealer or service center
This is not a difficult task and let me know if you need more info on this project
HOWEVER, make sure you have bad injectors before you start taking 'em out!