How big is the faucet here?
It states on the left hand side that the reward is 100 satoshi (50%) and 50 satoshi (50%), every 30 minutes.
Is there any site that offers bigger than this?
Yup there are a dozen faucets paying more than that, such as freebitco.in and moonbit.
But IMHO, the amount you can get from them is still too low and you should spend your time on other things.