Spyker
You are looking at R80 - R150 for the preamp valves (each) and R150 - R300 for the output valves.
Check Turntables and Tubes on FB
https://www.facebook.com/groups/1610818635861225/?ref=bookmarks
and SA Valve Amp Builders
https://www.facebook.com/groups/savalve/
for good deals.
Peter