SuperBenzin
Daily updated lowest and highest gas prices in the Czech Republic. Look for the two red and green pannelss on the right. Red is for highest and green is for lowest petrol price. The site also offers a map of the gas stations in the country but no pricing information there.
All prices are in Czech Coruna (CZK)
1 CZK ≈ 0.03 GBP 0.05 USD 0.04 EUR