Ava is a Polish bra band which is the #7 most popular Polish brand (according to the # of bras entered into bratabase -not necessarily a reflection of sales).
It recently started a sister line called Novika, which is a sexier line.
Ava can be purchased throughout Europe in many online stores. The company website is https://avalingerie.pl/en/
I'm only aware of one store that sells Polish brand, Ava, online in the U.S., Other Eden U.K. Note: Other Eden does ship from warehouses in Europe (via UPS), but they have a domestic returns portal in Nebraska, so I would consider them a US store, since the returns are domestic.