But check the fat balls and hanging sacks for ingredients- the cheaper ones are made with palm oil- and I can't see the point in feeding birds with what is killing the orang-outangs and the rain forest. None in Coop ones in CH, so I stick to that, even if a bit more expensive.
You might try Hornbach, in the aisle with the wild bird food.
Last year I mistakenly bought a bag of squirrel food - mixed nuts and such - instead of bird seed. Don't know if that was a one-off, or if it is a product they standardly carry.