Motorists are gearing up for the new autoroute vignette.
The annual permit costs 40 francs and will be required from February next year.
But discount retailers are sparking a price war. Lidl is offering the sticker for as low as CHF 19.90 francs, if shoppers spend at least CHF 70 and use its app.
Aldi is countering with a CHF 24 offer under similar spending conditions.
And Denner is sticking to its long-running approach, giving buyers a CHF 10 voucher with a 100-franc shop.
All offers are limited, but perfectly legal, as retailers buy vignettes at full price and absorb the discount to lure customers.
Heat to stay for now
Growing anger over World Cup red card
Fire damages trees in the Jardin Anglais
Cows sweltering in the heat
Lake Geneva nudists fight for their lake section
Holiday makers seek more than the sun
