I have no problems in getting them here in Germany.
WIMA FKP are available upto 220nF (2$)
WIMA MKP-10 even upto 3u3 (5$)
What voltage rating do you need? 600volts ? 1200 volts?
For high pulse resistance I think there is no alternative...
FKS (Polycarbonat) seems to be only available upto 10n/600 volts...