Traditional Czech under 100 CZK:

Lokál Hamburk (Korunní 96) - beef goulash with knedlíky dumplings 89 CZK, huge portion

U Fleku brewery - half roasted duck 145 CZK (splits between 2 people), includes kraut

Street food around Old Town:

Sausage stands near Astronomical Clock - klobása 35-45 CZK

Farmers market at náměstí Republiky - fresh bread 25 CZK per half loaf

Grocery price hacks:

Tesco Express half-liter beer 12 CZK vs tourist pub prices 60+ CZK

Albert supermarket deli counter - Czech open sandwiches (chlebíčky) 30 CZK vs restaurant 80 CZK