Bro no idea regarding the price of springs as I bought complete kabuli shocks including springs n shock mounts.
Later those kabuli shocks got leaked, so I only got replaced the struts with new KYB ones & using same springs
But I also faced alot of rear tire rubbing problem with these springs bcz of their extra softness, causing increased suspension travel, ended up with spacers/packing in the rear shocks bcz I wasn't willing to compromise on the comfort, by getting desi hard springs.