When looking for bargain prices, I'd recommend Vino VinTana which in my opinion carries a much better selection than Denner as far as your daily table wines are concerned. And I would almost say that majority of their rates seem to be below 20 chf, in fact just last Saturday I spent a total of 55 chf for 9 bottles - nothing fancy, sure, but for some easily drinkable Italian Primitivo, Chilean Merlot and Austrian Riesling I thought it was more than a fair deal.

But for the really nice ones, you've got to trust Vintage and Vine