First step is to mark the tire and rim at the high spot with a piece of chalk or sharpie or something similar. Put a line from the tread, down the sidewall and across the rim right at the high spot.
Then take the tire off, rotate it 180° on the rim and reinstall.
If the high spot stays where it is then the problem is with the rim, rim tape or tube. If the high spot moves to the other side of the wheel then the tire is the problem.
Proceed accordingly from there.
Aside from that.... Some can actually feel overlapped or incorrectly installed rim tape. Make sure the rim tape is not folded over or overlapped at the end. Extra thick glue patches can be felt in very thin, supple tires as well. Make sure the tire is inflated properly.
If it is the tires then any decent name brand should do. Vittoria, Schwalbe, Michelin, Continental, etc.
I'd be interested in seeing the eBay ad or knowing the brand and model of the potentially defective tires.
-Tim-