New York – Sony dropped the price on its internal and external rewritable DVD PC drives with the introduction of two $30 rebates good through the end of July. Starting July 18 the company’s DRU-510A Dual RW internal DVD burner, which can write to both plus and dash media, will sell for $279, after $30 mail in rebate. The DRX-510UL DualRW external model will drop to $349, after rebate.