Well, well, well: Coop is pushing its low-price brand Prix Garantie and PENG-ZACK-RUMMS! Migros is following suit - at least with a competition.
https://commentmatch.m-budget.migros.ch/de/
By the way, yet another page where you have to log in with your Migros login to take part, but there's no option to log out again. Or have I simply overlooked it so far? At least at the top right, as usual, there is nothingxxx...