One argument made by naysayers when 3D TV first arrived was that the feature would jack up prices for flat-panel sets. That did prove sort of true at first, but 3D was quickly folded into the general feature package for most TVs, leaving set prices to continue their downward trajectory. Case in point: Panasonic’s new TC-P55ST50. The first Panasonic 3D TV I reviewed 2 years back had a 50-inch screen and cost $2,600. But the company’s new P55ST50 3D plasma has a larger, 55-inch screen and costs around $1,600. Depending on how the rest of this review plays out, that could mean we have a serious bargain on our hands.