Amazon offers Prime members the Philips 40-watt Equivalent LED Light Bulb 16-Pack in
Soft White, model no. 461145, or Daylight, model no. 461160, for $19.99 with free shipping. (Non-members can spend $49 to bag free shipping; otherwise, it adds $7.55.) That's the lowest total price we could find by $5. They use about 5.5 watts and last about 10 years.