Julio Cano

The tires which I bought on ebay cannot be balanced, it’s out of round.Tried riding and had wobble. 
It was mounted in shop and they also put it on a rim they had sitting in the shop and same issue to confirm it.
Are they defective ?
They have brand new high quality tires for my  old suzuki gsxr750 and want about $600 for two tires.
Is it worth it to pay that much or buy another set of front rear tires like Hexautoparts which has good reviews on trustpilot.com?
Any recommendations ?
Thank you.

Hi Everyone
Thank you for welcoming me into the group. I am a new member  with a nice 1999 suzuki gsxr750 driver that I really enjoy.  Using as daily driver.