T8 bulbs are being discontinued.
T8 fluorescent bulbs were discontinued and phased out in August 24th 2023.
The production and imports of T8 fluorescent bulbs are also banned in the EU.
The phase out of T8 fluorescent bulbs is a part of a global effort to reduce mercury pollution and CO2 emissions.
Fluorescent bulbs use almost twice as much electricity as LED bulbs do which are more energy efficient.
You may be able to find some in some stores that still have them in stock or online but T8 bulbs are no longer being manufactured.