How do i pick a "good" grocery store tea?

Hey all! Long story short, I'm not going to be home for a month due to work, and i couldn't take any of my tea equipment or tea itself.

My budget is pretty low as well, and so I want to fill this tea void with something that will at least taste like proper tea.

Most grocery store teas I've tried tasted either cheap or like they were chemically enhanced with artificial aromas, and so i'm pretty sceptical on what to get.

For context, my favorite teas are japanese greens, particularly kukicha and gyokuro, but i also like to drink oolong from time to time. Do you guys think there's a chance i'll find something neat within a small price range? Unfortunately, has to be bagged as well.

PS: Forgot to mention, i live in Poland, so unless you also come from here, you can only really give me directions on how to pick the right tea.

Thanks in advance!