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Amazon has the GE Lighting 20996 65-Watt R30 Plant Flood Light Bulb for $ 2.29.
Free shipping with Prime.
https://www.amazon.com/GE-Lightin…000HJ743U/

Uses 65 watts
1 bulb per package
Lasts 1.8 years based on 3 hours per day usage
R30 shape with medium base that makes plants look healthier and greener
Estimated yearly energy costs $ 7.83 based on 3 hours per day $ 0.11 per kWh

Compare to Google Express / Overstock at $ 21.59.