Bonneville Brake Disc

Hi all,

The front brake disc is warped a little on my 2003 T100, at least I think that is the problem, after bleeding the brakes, twice, and using new fluid each time, I still get pulsating through the brake lever under braking on the front brake.

I'm looking for some advice on where to get a replacement disc, I don't ride particularly hard or aggressive so an upgrade is probably not required. Anyone got any good links or shops to try where it doesn't cost the earth!?

Is it advisable to change just the disc? Or should this not be changed alone without some other components at the same time?

Thanks in advance!
Ben