Timothy Hay is a staple in your Rabbits diet,and should be on hand at all times in unlimited amounts.
I've tried the Kaytee brand a few times,and the Rabbits seem to enjoy it alot.
It comes in a resealable bag which is great for keeping it fresh,and the price is reasonable.
Kaytee is also a product that seems to be pretty easy to find at the local Petshops and stores.

Pros: sealed bag to keep fresh easy to find

Cons: none as far as I've noticed.

My Lionhead bunnies love their treats. As you know happy bunnies will do little kicks when they are happy or excited and this is one of those that is sure to please. You will like it also makes clean up alot easier. My bunnies are liter trained and refuse to allow any liter in the botom of their pens. But I can get away with it by using the hay. Have a great day!

Pros: Keeps poop from getting loose

Cons: Not always nice and green

Our hammy really loved this. She would devour it whenever the kids gave it to her. Only downfall was my wife is very allergic so we would have to make sure she wasn't in the house and wasn't planning on touching the hammy when we gave it to Whiskers.

Pros: The hammy loved it

Cons: Wife very allergic

My babz absolutely goes nuts when she knows she's getting Timothy hay. She will happily chew away on it all day, untill it's all gone. I give a big thumbs up!

Pros: Yum

Cons: none

Our shelter always keeps some of this on hand in case a rabbit of other small animal is surrendered. It makes it easier to clean and the animals love it.

Pros: none

Cons: none