Traditional 100-watt "A19" shaped incandescent bulbs have been phased out because they do not meet the federal requirement of 45 lumens per watt. However, you can still buy 100-watt incandescent bulbs in these categories: Incandescent Light Bulbs - 1000Bulbs.com
In the United States, purchasing traditional 100-watt incandescent light bulbs for general home use is now restricted due to federal energy efficiency regulations. While standard household versions are banned from manufacture and sale, specific specialty and decorative incandescent bulbs remain available. Availability and Purchase Options buy 100 watt incandescent light bulbs