In the clearance section of a local Lowes, 30328, I noted nicely reduced T8 bulbs for 4.99$/ 4-pack from 22.00$. This is a B&M deal only as the online reference shows that the item is no longer available.
Web address for reference: https://www.lowes.com/pd/Utilitec...1000264747
If you still have the 4-foot light housing or plan to buy the housing, this will make a nice deal at 1.25$/ bulb. These give 20,000 hours of operation in the Kelvin temp colours 4000, 5000 and 6000. These bulbs do require an electronic ballast and do not work with direct wiring. If your light housing is less than 40-years old, it likely has an electronic ballast and not the magnetic type. I connected the 5000k bulb to a 15-year old housing and it worked fine. Here is a posting for the same bulbs earlier this year in February.
78% rating from 101 reviews.
BS links provided by energyx:
Bright White (4000k): https://brickseek.com/lowes-inven...1000264747
Cool White (5000k):- has been removed as an option from the Lowes website.
Daylight (6000): https://brickseek.com/lowes-inven...1000264759