Flat-panel monitor prices have been falling, but mostly on existing models, as opposed to new ones. Samsung broke the $500 price barrier on Thursday with its SyncMaster 570vTFT 15-inch LCD monitor. After a $50 mail-in rebate, the new SyncMaster will cost $499. Samsung plans to offer the rebate through June. The new flat-panel has .297 dot pitch and offers a maximum resolution of 1024 by 768.