Platter wobble


I have a Technics SL-BD20D and the platter has a noticeable wobble while spinning. ive tried a couple mats - cork and acrylic - which made the wobble much more apparent.  The rigid acrylic platter would not lay flat on the platter. 

Anything I can do? Is there a way to test what the issue is?  Is there an quality aftermarket platter that I can use?

Thanks!
leemaze
Thanks @noromance though it seems the AT95E will not work with my p-mount tonearm. Is there an equivalent p-mount?
Update: Sadly the new one wobbles worst than the original. 

Oh oh well was worth the shot. 
This is not good. Send it back. I was really hoping you could get up and running on the cheap.