What's wrong with your injectors? You can get reman injectors even cheaper at RockAuto Auto Parts
. You might even be able to find a place that will "rebuild" them for you. All they really do to them is ultrasonically clean them, and replace the screens and o-rings. Even the $50 ones at the part store have nothing else done to them. I think I paid $18 each at a parts place in town to have mine cleaned. He said nothing was wrong with them.
2003 Discovery S, 132K
2004 Acura TL
1999 Discovery II, 110K (Project)