You can buy 100 watt bulbs cheap by the case on the internet (ebay, amazon, etc).
Bought some 100 watt bulbs from a company through Amazon only to have the order cancelled. They won’t sell to Californians. I had to order the bulbs from an out of state company. They shipped them. Soon we’ll be ordering them from out of the country! Really? What a bunch of nuts we keep voting into office in this country...