Where are some good places to get clovers?

and also how do you get the clover box in the sewer, I've only just made it back to Citidel Island.

Find the cow on the Citadel Island, stand behind it and press X+forward. (Not kidding.)

There are respawnable clovers later in the game, be sure to check barrels/containers everywhere. You need to be able to move over water. That won't happen for a while, IIRC.

That cow is definitely the best "place" to get clovers :)

1. Press ESC to return to the menu.
2. Type "box" over and over until the notification in the upper left corner of the screen stops blinking.
3. Then type "full".
4. Return to the game and check your "behavior screen".
5. ???
6. Profit

The cow's already been mentioned, however there's also a spider later on that you can use to get lives out of. I believe for the spider you stand behind it and press action