Can anyone tell me where I can find an end cap light fixture for a reptisun 10.0 T8 18inch bulb? I haven't been able to find one that isn't through the roof expensive.
I haven't seen that style in the US, but I know Arcadia makes them because they are available in the UK https://www.reptiles.swelluk.com/arcadia-dry-t8-vivarium-controller-ip64/ I believe Komodo makes them too. I wish I could be of more help and link to a product available in the US, I just haven't seen them here.
For the 18'' T8 I usually recommend the Zilla Slimline fixture which works pretty well as far as T8 bulbs go because it has a built in reflector.