You can try Speedway Motor at Toh Guan, they posted in October saying that they've got 2 brand new GSR400 for sale. Spare parts aren't that difficult to find, you can buy from either Chong Aik, KS Motor or Guan Hoe. Cost wise, yes, I would think parts are slightly more expensive as compared to Super 4 because GSR does not have "local" parts like Super 4