Hello Yash,
Welcome to the forum. Well I'm from Gujarat but currently settled in Pune.
Even in the bigger cities people order parts from online stores, so you should not be facing any challenges in ordering parts in Surat as almost all the stores ship to Surat. There are many online stores like rcmumbai.com,
http://www.vibranthobbies.com/ are few of them.
Or you could mention your parts requirement in Wanted section of this forum itself and I am sure somebody will help you out with that.
Thank You.