Grains of Selim (Hwentia) in Houston??

It’s beginning to strike a nerve that I cannot find grains of selim ANYWHERE in Houston.

I’ve done the substitutions (black pepper, etc) and they are a huge disappointment, so do not suggest them.

It’s a fairly common ingredient in many rice or chicken/beef dishes, which is why it confuses me that so many African markets don’t know what I’m talking about when I ask for it.

Please help, thanks in advance!