Radegast is actually somewhat like the PBR of the Czech Republic (without the hipster following)- a good beer, but one that is a bit maligned because it is very cheap. It definitely does not have a larger market share than Pilsner Urquell though. However, you can still buy it at a grocery store for around 25 cents a half liter, but then again, you can buy the best beers for around 50 cents. And there are definitely cheaper beers, although I find that once you get to the 8-10 cents per half liter ones, the quality does start to drop to around that of Budweiser or Miller in the US. In any case, I agree that Radegast is a very good beer. If you like it, I'd definitely recommend exploring some of the other Czech beers beyond Urqell or Czechvar/Budvar (both of which, in my opinion, travel horribly). The Urquell available in the US is actually made differently than the domestic kind (with Polish water, at a different plant, etc) and I think it tastes like an entirely different beer, and a pretty mediocre one at that. Some excellent but harder to find Czech beers include Staropramen, Ferdinand, Branik and Bernard. Some of the dark czech beers are also good (especially Krusovice, but also Klaster dark and Herold), although they are considered the more "girly" option in the beer soaked CZR, on account of their fruit undertones. Lastly, I would encourage any beer lover to make a trip to Prague. The Czech's beer culture really is outstanding. Tthey consume more beer than any other country in the world and take beer making and consuming VERY seriously. I'll never forget things like the factory workers at the Skoda car works sipping their Pilner's at 10 am in the morning from built in coasters on the assembly line.