ALTHOUGH SPECIFICALLY REQUESTED; FSS BRIEFER FAILS TO PROVIDE RELEVANT NOTAMS FOR HELI PILOT'S IFR DESTINATION AIRPORT.

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I RECEIVED A REQUEST TO TRANSPORT A PAX FROM A FACILITY 50 MILES TO THE NORTHWEST. THE WEATHER WAS FORECAST TO BE IFR AND I ELECTED TO FILE AN IFR FLIGHT PLAN WITH FLIGHT SERVICE. DURING THE BRIEFING; I SPECIFICALLY REQUESTED ANY PERTINENT NOTAMS RELATED TO GPS APPROACHES AT MY DESTINATION. THE BRIEFER GAVE NO INDICATION THERE WERE ANY RELEVANT GPS NOTAMS AND RAIM AVAILABILITY SHOULD BE ADEQUATE FOR MY ROUTE. UPON ARRIVING IN THE VICINITY OF THE AIRPORT; THE WEATHER WAS BETTER THAN FORECAST AND DID NOT REQUIRE AN APPROACH. I DID REMAIN ON MY IFR FLIGHT PLAN AND REQUESTED THE RNAV (GPS) RWY XX FOR PRACTICE. I WAS CLEARED FOR THE APPROACH BY CENTER; AND THE ENTIRE APPROACH WAS CONDUCTED IN VFR CONDITIONS. LATER; I WAS INFORMED THE APPROACH HAD A NOTAM ISSUED STATING; 'THE ORIGINAL PROCEDURE N/A UNTIL FURTHER NOTICE.' MY MAIN CONCERN IS THE FACT I DID NOT RECEIVE THE RELEVANT NOTAMS; ALTHOUGH I MADE A REQUEST FOR SUCH. HAD I TRULY BEEN IN IMC CONDITIONS; THIS COULD HAVE BEEN A REAL ISSUE. I TYPICALLY CROSS CHECK NOTAMS DURING BRIEFINGS USING ON-LINE PRODUCTS; HOWEVER; IT'S NOT ALWAYS AVAILABLE.