Bulletproof glass comes in different rating levels as well as different configurations. The higher the level, generally the higher the cost. If the glass is curved versus flat it also is more expensive. In addition, if the glass is deemed a “one of a kind” or glass that has compound bends, that glass would generally be the most expensive. Generally, windshields in level B6 protection (high powered rifle)and curved starts at $4,250 to $10,000 whereas a side window starts at $2,650. This does not include installation or shipping costs.