We have Costco in Sweden, it's terrible, I'd never pay for a membership to be able to shop...

I've always found the cashback rewards to cover the membership cost, YMMV though. I also live for the hot dogs

They don't have a cashback program here.

Ah I didn't realize cashback was US and Canada only. Purchasing over $6000/year will cover the fee, which isn't cheap if you don't do much shopping there. The rewards site has a table with reward estimates: https://www.costco.com/executive-rewards.html

In the US, the standard Costco membership does not offer cash back, the premium membership does. If you don't have the auto-renewal set up, they'll tell you which version is a better deal based on your purchase history from the prior year.

We have Costco the last time I checked, at lest in the UK and Spain.

Lidl expanding into the US makes my european wife very happy.

There are some Trader Joe's products in my local Aldi in Poland.

At Aldi Nord in Germany, the "Trader Joe's" products are just the usual cheap garbage with a label slapped on it. It's nothing like the interesting stuff you get in the US.