The vemondo Barista Oat Drink from Lidl is great. Taste is a tiny bit less good than Oatly sadly, but at least you do not support fascists with the purchase (Oatly has a big MAGA shareholder). Note: be sure that you get the vemondo oat milk produced by "Grønvang" from Denmark. They also sometimes have batches from "White and Green" from the Netherlands (Vlissingen), which I find much less tasty (too watery). So don't buy those.