A genuine replacement is like $320 for one injector I belieive.. check perfectrun, greenline, nengun, rhdjapan etc for a set (6) of sard 534, 650, 660, 700 or 800cc injectors is about $730 delivered (been on special for the past few months).
Injectors you want top feed, low impedence, and make sure they are RB26 specific. Nismo 555cc and 600cc are direct fit, Sard 534cc to 700cc are a direct fit, 800cc require you to modify your injector plugs.
I believe people have recommended someone in WA I think it was (sending their injectors interstate to him), will clean your injectors and is able to fix them for cheap