I've got an Orange San Diego (UK), came in at less than £100 and has the specs of a phone worth well over double the price (one of the first phones in the world to run and intel processor), £10 a month gets me unlimited internet and all the texts / calls I need (not much since I usually use the internet for communicating anyway).
I've only had it a few months but I can't even comprehend living without it. Hell, it can even emulate old-school nintendo consoles pretty damn well. Fanmade pokémon games can be pretty damn good.