LOWE'S - YMMV - FLUORESCENT TUBE LIGHT BULB
GE 32-Watt 48-in Medium Bi-pin T8 3000K Warm White Fluorescent Light Bulb 2-Pack
Some have it down to $0.20 for a 2-pack and in cases (24 2-packs per case).
Steps to replicate:
1. Click on brickseek link and enter zip code.
2. Go and visit store with stock and ask them to scan for the Item #621148.
3. Stock up on garage light bulbs for life!
GE 2-Pack 32-Watt 3000K Warm White Linear Fluorescent Tube Light Bulbs (Common: 48-in; Actual: 48-in)
Item #621148 Model #66834
Uses 32 Watts (2975 lumens)
3000 Kelvin warm white light
The Kelvin rating is for how warm or blue you want the light. I preferred the warm white (3000K), but they do sell others across the spectrum (3500K (neutral white), 4100K (cool white), 5000K (cool blue), etc.).