depends on the site. Pokerstars, you can build a great bankroll by playing the 180 person sngs. I personally got my start on those when all there was was the $4/180 $11/180 and $22/180 non-turbo sngs. Now they have the $1's $2's $4s $7s $11s $15s allt he way up to $65s.

On carbon they have sngs as well as hyper-turbo sngs and mtts that are good. I personally got a br on carbon by depositing $100 playing a $33 sunday superstack and winning it for $4500

if you are on the Winning Poker Network, they have the on demand tournaments 55 cents will get you between $11 and $20 if you win. They also have the Big10 tournaments that are a really good value.