Unless you have a severe wobble in the disc, we would actually recommend you try truing the rotor first to see if that will be sufficient. Any smaller wobbles can be easily removed. You can use a tool like this: https://www.youtube.com/watch?v=O0c2Ez2v0PU
Bike shops in your area should be able to help with that as well.
If you are not able to resolve it as per the above instructions, we can certainly provide a new rotor.