How much does it cost to pay someone to build a website?

I realize that the answer is not straight forward, but how should one begin to approach this question?

If I wanted to make website like 'games.com' just with one or two high-functioning, simple, visually-appealing, and easy-to-use games (like Family Feud or Book Worm)--could I pay someone to do this with a teacher's salary? Or should I be looking for investors? (What level of expertise should I develop in web site design and develop for myself so that I don't get ripped off?)