For this, we would suggest you walk into the nearest authorized service centre as they will be the better person to assist you regarding the availability of spare parts and price for the parts. You can click on the following link to see the details of the nearest service centre and selecting your city accordingly - Service centre
I was waiting for yamaha R3-2019 since November-2018, was expected to be launched in 1st quarter-2019, got postponed....2019 never made it to India,Had hopes that R3-2020 will be launched on 19thDec,2019, again NO. Now with latest news, one thing is clear, Yamaha ain't launching R3 before 2021.