I just ordered these from
Summit. The best prices I've found, but I had to wait a week for the head and main studs. Note that the head stud kit is for the 11 stud Cooper S head - actually cheaper than the 9 stud kit - just save the other studs for something else. The 9 stud kit is part # ARP-206-4201 but they are $101.88.
ARP-206-2802 BMC A-SERIES FLYWHEEL BOLT KIT -$23.39
ARP-206-4206 HEAD STUD KIT - $81.39
ARP-206-5401 BMC A-SERIES MAIN STUD KIT - $51.99
ARP-206-6001 BMC A-SERIES 3/8 ROD BOLT KIT - $77.39